remove pointless mac scope

this subdir is only entered on mac.
also, if this scope was actually skipped, the result would be rather
unexpected ...

Change-Id: Ie46b0bfcac081ff55b737c444d15ff6afaf1507b
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

src/macdeployqt/macdeployqt.pro

-
-mac {
-
 TEMPLATE = subdirs
 SUBDIRS = macdeployqt macchangeqt
-
-}