Display 2 decimals instead of 1 in editor frametime labels

When comparing different graphics settings or optimizations,
this makes precise measurements and frametime comparisons easier.

This also makes the editor FPS display use `pad_decimals()`
for consistency with the implementation in `master`.

editor/plugins/spatial_editor_plugin.cpp

@@ -2618,7 +2618,7 @@ void SpatialEditorViewport::_notification(int p_what) {
 		if (show_fps) {
 			String text;
 			const float temp_fps = Engine::get_singleton()->get_frames_per_second();
-			text += vformat(TTR("FPS: %d (%s ms)"), temp_fps, String::num(1000.0f / temp_fps, 2));
+			text += vformat(TTR("FPS: %d (%s ms)"), temp_fps, rtos(1000.0f / temp_fps).pad_decimals(2));
 			fps_label->set_text(text);
 		}
 

main/main.cpp

@@ -2248,10 +2248,10 @@ bool Main::iteration() {
 	if (frame > 1000000) {
 		if (editor || project_manager) {
 			if (print_fps) {
-				print_line(vformat("Editor FPS: %d (%s mspf)", frames, rtos(1000.0 / frames).pad_decimals(1)));
+				print_line(vformat("Editor FPS: %d (%s mspf)", frames, rtos(1000.0 / frames).pad_decimals(2)));
 			}
 		} else if (GLOBAL_GET("debug/settings/stdout/print_fps") || print_fps) {
-			print_line(vformat("Project FPS: %d (%s mspf)", frames, rtos(1000.0 / frames).pad_decimals(1)));
+			print_line(vformat("Project FPS: %d (%s mspf)", frames, rtos(1000.0 / frames).pad_decimals(2)));
 		}
 
 		Engine::get_singleton()->_fps = frames;