Change placeholder material colors

CURA-2070

resources/materials/generic_abs.xml.fdm_material

@@ -11,7 +11,7 @@ Generic PLA profile. Serves as an example file, data in this file is not correct
         </name>
         <GUID>60636bb4-518f-42e7-8237-fe77b194ebe0</GUID>
         <version>0</version>
-        <color_code>#FF0000</color_code>
+        <color_code>#8cb219</color_code>
     </metadata>
     <properties>
         <density>1.07</density>

resources/materials/generic_cpe.xml.fdm_material

@@ -11,7 +11,7 @@ Generic PLA profile. Serves as an example file, data in this file is not correct
         </name>
         <GUID>12f41353-1a33-415e-8b4f-a775a6c70cc6</GUID>
         <version>0</version>
-        <color_code>#0000FF</color_code>
+        <color_code>#159499</color_code>
     </metadata>
     <properties>
         <density>0.94</density>

resources/materials/generic_pla.xml.fdm_material

@@ -11,7 +11,7 @@ Generic PLA profile. Serves as an example file, data in this file is not correct
         </name>
         <GUID>506c9f0d-e3aa-4bd4-b2d2-23e2425b1aa9</GUID>
         <version>0</version>
-        <color_code>#00FF00</color_code>
+        <color_code>#ffc924</color_code>
     </metadata>
     <properties>
         <density>1.3</density>