macosx: fixed window button alignment when using the black UI mode

Pointed by Damien.

Manual back-port of f836a238bae817640c4f0a1b1c5289241e181eaa

extras/package/macosx/Resources/English.lproj/MainMenu.xib

@@ -2,7 +2,7 @@
 <archive type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="7.10">
   <data>
     <int key="IBDocument.SystemTarget">1050</int>
-    <string key="IBDocument.SystemVersion">11G15</string>
+    <string key="IBDocument.SystemVersion">11E53</string>
     <string key="IBDocument.InterfaceBuilderVersion">851</string>
     <string key="IBDocument.AppKitVersion">1138.47</string>
     <string key="IBDocument.HIToolboxVersion">569.00</string>
@@ -21,16 +21,16 @@
     </object>
     <object class="NSMutableArray" key="IBDocument.EditedObjectIDs">
       <bool key="EncodedWithXMLCoder">YES</bool>
-      <integer value="4596"/>
+      <integer value="2730"/>
+      <integer value="4722"/>
+      <integer value="4756"/>
       <integer value="915"/>
       <integer value="1617"/>
+      <integer value="4596"/>
       <integer value="2770"/>
       <integer value="81"/>
-      <integer value="2730"/>
       <integer value="4850"/>
       <integer value="4948"/>
-      <integer value="4756"/>
-      <integer value="4722"/>
     </object>
     <object class="NSArray" key="IBDocument.PluginDependencies">
       <bool key="EncodedWithXMLCoder">YES</bool>
@@ -4461,7 +4461,7 @@ LCAuLi4</string>
           <object class="NSButton" id="880009621">
             <reference key="NSNextResponder" ref="661733562"/>
             <int key="NSvFlags">268</int>
-            <string key="NSFrame">{{48, 1}, {14, 16}}</string>
+            <string key="NSFrame">{{48, 3}, {14, 16}}</string>
             <reference key="NSSuperview" ref="661733562"/>
             <string key="NSReuseIdentifierKey">_NS:610</string>
             <bool key="NSEnabled">YES</bool>
@@ -4483,7 +4483,7 @@ LCAuLi4</string>
           <object class="NSButton" id="297736534">
             <reference key="NSNextResponder" ref="661733562"/>
             <int key="NSvFlags">268</int>
-            <string key="NSFrame">{{28, 1}, {14, 16}}</string>
+            <string key="NSFrame">{{28, 3}, {14, 16}}</string>
             <reference key="NSSuperview" ref="661733562"/>
             <string key="NSReuseIdentifierKey">_NS:610</string>
             <bool key="NSEnabled">YES</bool>
@@ -4505,7 +4505,7 @@ LCAuLi4</string>
           <object class="NSButton" id="425279991">
             <reference key="NSNextResponder" ref="661733562"/>
             <int key="NSvFlags">268</int>
-            <string key="NSFrame">{{8, 1}, {14, 16}}</string>
+            <string key="NSFrame">{{8, 3}, {14, 16}}</string>
             <reference key="NSSuperview" ref="661733562"/>
             <string key="NSReuseIdentifierKey">_NS:610</string>
             <bool key="NSEnabled">YES</bool>