[macOS] change "Complete Symbol" shortcut to not conflict with Spotlight

The default shortcut for Spotlight search is Command+Space so try not to
use it. Instead use Ctrl+Space similar to Xcode.

editor/plugins/script_text_editor.cpp

@@ -1549,10 +1549,11 @@ void ScriptTextEditor::register_editor() {
 	ED_SHORTCUT("script_text_editor/unfold_all_lines", TTR("Unfold All Lines"), 0);
 #ifdef OSX_ENABLED
 	ED_SHORTCUT("script_text_editor/clone_down", TTR("Clone Down"), KEY_MASK_SHIFT | KEY_MASK_CMD | KEY_C);
+	ED_SHORTCUT("script_text_editor/complete_symbol", TTR("Complete Symbol"), KEY_MASK_CTRL | KEY_SPACE);
 #else
 	ED_SHORTCUT("script_text_editor/clone_down", TTR("Clone Down"), KEY_MASK_CMD | KEY_B);
-#endif
 	ED_SHORTCUT("script_text_editor/complete_symbol", TTR("Complete Symbol"), KEY_MASK_CMD | KEY_SPACE);
+#endif
 	ED_SHORTCUT("script_text_editor/trim_trailing_whitespace", TTR("Trim Trailing Whitespace"), KEY_MASK_CMD | KEY_MASK_ALT | KEY_T);
 	ED_SHORTCUT("script_text_editor/convert_indent_to_spaces", TTR("Convert Indent To Spaces"), KEY_MASK_CMD | KEY_MASK_SHIFT | KEY_Y);
 	ED_SHORTCUT("script_text_editor/convert_indent_to_tabs", TTR("Convert Indent To Tabs"), KEY_MASK_CMD | KEY_MASK_SHIFT | KEY_X);