Remove Show Ruler shortcut (fixes #32639)

Removed default shortcut because of the conflict mentioned in the issue.
Command + Shift + T would conflict with Soft Reload Script,
and this shortcut doesn't seem to be needed very often.

editor/plugins/canvas_item_editor_plugin.cpp

@@ -5359,7 +5359,7 @@ CanvasItemEditor::CanvasItemEditor(EditorNode *p_editor) {
 	p->set_hide_on_checkable_item_selection(false);
 	p->add_check_shortcut(ED_SHORTCUT("canvas_item_editor/show_grid", TTR("Show Grid"), KEY_G), SHOW_GRID);
 	p->add_check_shortcut(ED_SHORTCUT("canvas_item_editor/show_helpers", TTR("Show Helpers"), KEY_H), SHOW_HELPERS);
-	p->add_check_shortcut(ED_SHORTCUT("canvas_item_editor/show_rulers", TTR("Show Rulers"), KEY_MASK_CMD | KEY_R), SHOW_RULERS);
+	p->add_check_shortcut(ED_SHORTCUT("canvas_item_editor/show_rulers", TTR("Show Rulers")), SHOW_RULERS);
 	p->add_check_shortcut(ED_SHORTCUT("canvas_item_editor/show_guides", TTR("Show Guides"), KEY_Y), SHOW_GUIDES);
 	p->add_check_shortcut(ED_SHORTCUT("canvas_item_editor/show_origin", TTR("Show Origin")), SHOW_ORIGIN);
 	p->add_check_shortcut(ED_SHORTCUT("canvas_item_editor/show_viewport", TTR("Show Viewport")), SHOW_VIEWPORT);