Set SolidView to invisible.

Since we don't have a selector in the prepare stage anymore, solidview must be invisible

CURA-5829

plugins/PreviewStage/PreviewMenu.qml

@@ -50,7 +50,6 @@ Item
             {
                 for (var i = 0; i < model.rowCount(); i++)
                 {
-                    print(model.getItem(i).active)
                     if (model.getItem(i).active)
                     {
                         return i;

plugins/SolidView/__init__.py

@@ -10,7 +10,8 @@ def getMetaData():
     return {
         "view": {
             "name": i18n_catalog.i18nc("@item:inmenu", "Solid view"),
-            "weight": 0
+            "weight": 0,
+            "visible": False
         }
     }