Fix T65092: error with gizmos using freed keymaps

Caused by 5adfc51a0f, sharing keymaps caused changing tools to
unregister gizmos and remove their keymaps.

Workaround for now by not removing the keymap.

source/blender/windowmanager/gizmo/intern/wm_gizmo_group.c

@@ -921,8 +921,12 @@ void WM_gizmomaptype_group_unlink(bContext *C,
     WM_gizmomaptype_group_free(gzgt_ref);
   }
 
+  /* TODO(campbell): Gizmos may share keymaps, for now don't
+   * remove however we could flag them as temporary/owned by the gizmo. */
+#if 0
   /* Note, we may want to keep this keymap for editing */
   WM_keymap_remove(gzgt->keyconf, gzgt->keymap);
+#endif
 
   BLI_assert(WM_gizmomaptype_group_find_ptr(gzmap_type, gzgt) == NULL);
 }