osgeo4w: add qt plugin directories to browser with grass (followup b7…

…58a8c)

ms-windows/osgeo4w/browser-grass.bat.tmpl

@@ -4,4 +4,5 @@ call "%OSGEO4W_ROOT%"\apps\grass\grass-@grassversion@\etc\env.bat
 @echo off
 path %OSGEO4W_ROOT%\apps\@package@\bin;%OSGEO4W_ROOT%\apps\grass\grass-@grassversion@\lib;%OSGEO4W_ROOT%\apps\grass\grass-@grassversion@\bin;%PATH%
 set QGIS_PREFIX_PATH=%OSGEO4W_ROOT:\=/%/apps/@package@
+set QT_PLUGIN_PATH=%OSGEO4W_ROOT%\apps\@package@\qtplugins;%OSGEO4W_ROOT%\apps\qt4\plugins
 start "QGIS Browser" /B "%OSGEO4W_ROOT%"\bin\@package@-browser-bin.exe %*