Disable resizing for prefs windows.

MASPreferencesWindow.xib

@@ -13,7 +13,7 @@
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
         <customObject id="-3" userLabel="Application"/>
         <window allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" oneShot="NO" releasedWhenClosed="NO" showsToolbarButton="NO" wantsToBeColor="NO" visibleAtLaunch="NO" frameAutosaveName="" animationBehavior="default" id="1">
-            <windowStyleMask key="styleMask" titled="YES" closable="YES" resizable="YES"/>
+            <windowStyleMask key="styleMask" titled="YES" closable="YES"/>
             <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
             <rect key="contentRect" x="540" y="400" width="360" height="270"/>
             <rect key="screenRect" x="0.0" y="0.0" width="1440" height="878"/>