Fix darwin-bundle high DPI

Author: provokateurin

assets/packaging/darwin-bundle/Info.plist.tmpl

@@ -32,5 +32,7 @@
         <true/>
         <key>NSHumanReadableCopyright</key>
         <string></string>
+        <key>NSPrincipalClass</key>
+        <string>NSApplication</string>
     </dict>
 </plist>