Hide the rotation gizmo when editor cinematic preview is enabled

Cinematic preview enables the Camera3D preview automatically.

When previewing a Camera3D, the rotation gizmo isn't displayed as
it can't be used.

(cherry picked from commit fa1d853eeb91c7ff7f89010d8454f7006f3dac85)

editor/plugins/spatial_editor_plugin.cpp

@@ -3162,6 +3162,8 @@ void SpatialEditorViewport::_toggle_camera_preview(bool p_activate) {
 
 void SpatialEditorViewport::_toggle_cinema_preview(bool p_activate) {
 	previewing_cinema = p_activate;
+	rotation_control->set_visible(!p_activate);
+
 	if (!previewing_cinema) {
 		if (previewing != NULL)
 			previewing->disconnect("tree_exited", this, "_preview_exited_scene");