Un-xibless-ified DirectoryPanel

This was a tricky one because the XIB couldn't be read by a modern
Xcode. I had to go back to 10.8's Xcode to read it properly, save it,
and then read it on 10.12. And even then, there we tons of little weird
values here and there.

build.py

@@ -79,15 +79,6 @@ def cocoa_app():
 def build_xibless(dest='cocoa/autogen'):
     import xibless
     ensure_folder(dest)
-    FNPAIRS = [
-        ('problem_dialog.py', 'ProblemDialog_UI'),
-        ('directory_panel.py', 'DirectoryPanel_UI'),
-    ]
-    for srcname, dstname in FNPAIRS:
-        xibless.generate(
-            op.join('cocoa', 'ui', srcname), op.join(dest, dstname),
-            localizationTable='Localizable'
-        )
     for appmode in ('standard', 'music', 'picture'):
         xibless.generate(
             op.join('cocoa', 'ui', 'preferences_panel.py'),