Convert the Screen Space Shaders demo back to GLES 3

.gitignore

@@ -9,6 +9,7 @@ export_presets.cfg
 
 # Mono-specific ignores
 .mono/
+data_*/
 mono_crash.*.json
 
 # System/tool-specific ignores

2d/screen_space_shaders/README.md

@@ -5,7 +5,7 @@ Many common full-res effects are implemented here for reference.
 
 Language: [GDSL](https://docs.godotengine.org/en/latest/tutorials/shading/shading_reference/shading_language.html) and GDScript
 
-Renderer: GLES 2
+Renderer: GLES 3
 
 ## Screenshots
 

2d/screen_space_shaders/project.godot

@@ -32,7 +32,3 @@ stretch/mode="2d"
 [gdnative]
 
 singletons=[  ]
-
-[rendering]
-
-quality/driver/driver_name="GLES2"