Make 'other' the default category

This should make it a bit easier for others to create a new definition since there is less for them to 'have to know'. Previously they would be required to fill in as category Other, but now they can just leave the category out.

resources/definitions/101Hero.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "rikky",
         "manufacturer": "101Hero",
-        "category": "Other",
         "machine_extruder_trains":
         {
             "0": "fdmextruder"

resources/definitions/3dator.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "3Dator GmbH",
         "manufacturer": "3Dator GmbH",
-        "category": "Other",
         "file_formats": "text/x-gcode",
         "icon": "icon_ultimaker2",
         "supports_usb_connection": true,

resources/definitions/abax_pri3.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "ABAX 3d Technologies",
         "manufacturer": "ABAX 3d Technologies",
-        "category": "Other",
         "file_formats": "text/x-gcode"
     },
     "overrides": {

resources/definitions/abax_pri5.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "ABAX 3d Technologies",
         "manufacturer": "ABAX 3d Technologies",
-        "category": "Other",
         "file_formats": "text/x-gcode"
     },
     "overrides": {

resources/definitions/abax_titan.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "ABAX 3d Technologies",
         "manufacturer": "ABAX 3d Technologies",
-        "category": "Other",
         "file_formats": "text/x-gcode"
     },
     "overrides": {

resources/definitions/alya3dp.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "ALYA",
         "manufacturer": "ALYA",
-        "category": "Other",
         "file_formats": "text/x-gcode"
     },
 

resources/definitions/bfb.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "Ultimaker",
         "manufacturer": "BFB",
-        "category": "Other",
         "file_formats": "text/x-gcode",
         "platform_offset": [ 0, 0, 0]
     },

resources/definitions/bq_hephestos.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "BQ",
         "manufacturer": "BQ",
-        "category": "Other",
         "file_formats": "text/x-gcode",
         "platform": "bq_hephestos_platform.stl",
         "platform_offset": [ 0, -82, 0]

resources/definitions/bq_hephestos_2.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "author": "BQ",
         "manufacturer": "BQ",
-        "category": "Other",
         "platform": "bq_hephestos_2_platform.stl",
         "platform_offset": [6, 1320, 0 ],
         "file_formats": "text/x-gcode"

resources/definitions/bq_hephestos_xl.def.json

@@ -7,7 +7,6 @@
         "visible": true,
         "manufacturer": "BQ",
         "author": "BQ",
-        "category": "Other",
         "file_formats": "text/x-code",
         "platform": "bq_hephestos_platform.stl",
         "platform_offset": [ 0, -82, 0]