added limit mimetype for 3mf project and removed saving ucp as mesh writer

CURA-11715

plugins/3MFWriter/__init__.py

@@ -33,12 +33,6 @@ def getMetaData():
                     "mime_type": "application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
                     "mode": ThreeMFWriter.ThreeMFWriter.OutputMode.BinaryMode
                 },
-                {
-                    "extension": "3mf",
-                    "description": i18n_catalog.i18nc("@item:inlistbox", "Universal Cura Project"),
-                    "mime_type": "application/x-ucp",
-                    "mode": ThreeMFWriter.ThreeMFWriter.OutputMode.BinaryMode
-                }
             ]
         }
         metaData["workspace_writer"] = {

resources/qml/Menus/FileMenu.qml

@@ -51,6 +51,7 @@ Cura.Menu
                 "filter_by_machine": false,
                 "file_type": "workspace",
                 "preferred_mimetypes": "application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
+                "limit_mimetypes":["application/vnd.ms-package.3dmanufacturing-3dmodel+xml"],
             };
             if (UM.Preferences.getValue("cura/dialog_on_project_save"))
             {