Silence the errors about OSC 7

Up to now this poorly designed and completely unnecessary escape code
was relegated to only GNOME, however, off late Apple has started using
it as well, so silently ignore it, instead of spamming error messages
for it.

kitty/parser.c

@@ -392,6 +392,10 @@ dispatch_osc(Screen *screen, PyObject DUMP_UNUSED *dump_callback) {
             START_DISPATCH
             DISPATCH_OSC_WITH_CODE(set_color_table_color);
             END_DISPATCH
+        case 7:
+            START_DISPATCH
+            DISPATCH_OSC_WITH_CODE(process_cwd_notification);
+            END_DISPATCH
         case 8:
             dispatch_hyperlink(screen, i, limit-i, dump_callback);
             break;