UI: Grey out 'Show Object Origins' option in paint modes

The overlay is not shown in any of these modes, grey out the option
to better indicate to users that it is expected to have no effect.

Part of #93501

Pull Request: https://projects.blender.org/blender/blender/pulls/146876

scripts/startup/bl_ui/space_view3d.py

@@ -7036,6 +7036,7 @@ class VIEW3D_PT_overlay_object(Panel):
         view = context.space_data
         overlay = view.overlay
         display_all = overlay.show_overlays
+        mode = context.mode
 
         col = layout.column(align=True)
         col.active = display_all
@@ -7053,9 +7054,23 @@ class VIEW3D_PT_overlay_object(Panel):
         sub = split.column(align=True)
         sub.prop(overlay, "show_bones", text="Bones")
         sub.prop(overlay, "show_motion_paths")
-        sub.prop(overlay, "show_object_origins", text="Origins")
+
+        can_show_object_origins = False if mode in {
+            'PAINT_TEXTURE',
+            'PAINT_2D',
+            'SCULPT',
+            'PAINT_VERTEX',
+            'PAINT_WEIGHT',
+            'SCULPT_CURVES',
+            'PAINT_GREASE_PENCIL',
+            'VERTEX_GREASE_PENCIL',
+            'WEIGHT_GREASE_PENCIL',
+            'SCULPT_GREASE_PENCIL'} else True
         subsub = sub.column()
-        subsub.active = overlay.show_object_origins
+        subsub.active = can_show_object_origins
+        subsub.prop(overlay, "show_object_origins", text="Origins")
+        subsub = sub.column()
+        subsub.active = can_show_object_origins and overlay.show_object_origins
         subsub.prop(overlay, "show_object_origins_all", text="Origins (All)")