add missing file from 72e779c

Author: jef-n

ms-windows/osgeo4w/designer-qgis.bat.tmpl

@@ -0,0 +1,6 @@
+@echo off
+call "%~dp0\o4w_env.bat"
+path %OSGEO4W_ROOT%\apps\@package@\bin;%OSGEO4W_ROOT%\apps\grass\grass-@grassversion@\lib;%PATH%
+set QGIS_PREFIX_PATH=%OSGEO4W_ROOT:\=/%/apps/@package@
+set QT_PLUGIN_PATH=%OSGEO4W_ROOT%\apps\@package@\qtplugins;%OSGEO4W_ROOT%\apps\qt4\plugins
+start "Qt Designer with QGIS custom widgets" /B "%OSGEO4W_ROOT%"\bin\designer.exe %*