update plugin installer for new API

git-svn-id: http://svn.osgeo.org/qgis/trunk@9240 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: jef

python/plugins/plugin_installer/installer_plugin.py

@@ -43,5 +43,5 @@ def unload(self):
   def run(self):
     # create and show a configuration dialog 
     flags = Qt.WindowTitleHint | Qt.WindowSystemMenuHint | Qt.WindowMaximizeButtonHint 
-    self.gui = InstallerPluginGui(self.iface.getMainWindow(),flags)
+    self.gui = InstallerPluginGui(self.iface.mainWindow(),flags)
     self.gui.show()