Fix 3D viewport grid disappearing on scene tab changes

[Yadnesh-Kulkarni]

Grid disappearance in 3D viewport on scene change occurred because editor states which controlled grid draw and update were not being reset on scene change.
Fixed grid disappearance in 3D viewport on scene tab change by resetting the editor states for grid draw and update.

• Fixes Grid view disappears #78588

[akien-mga]

Thanks for your first contribution! I haven't reviewed in depth but re-initializing state like this seems like a good approach to solving this issue.

For the record, your commit seems not to be linked to your GitHub account. See: Why are my commits linked to the wrong user? for more info.

[Yadnesh-Kulkarni]

@akien-mga Thanks for bringing this to my attention. I have changed my git config and pushed which also removes a blank space added unnecessarily in the previous commit. Resetting the state seemed like a quick and feasible approach. It works fine for the given use case as well as a few more tests I performed.

[clayjohn]

Looked through the surrounding code a bit and this seems to be the correct solution. The MENU_VIEW_GRID checkbox is set to true in the line above, so the grid_enabled setting needs to be updated to match. grid_init_draw specifies whether the grid should be redrawn (if false it redraws), and it should in this case, so setting it to false is correct

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉

[YuriSizov]

Cherry-picked for 4.1.1.