windows: adjust PYTHONPATH update in test-status-color.t

On Windows the PATH separator is ";", not ":". The Windows wheel wants it set
with ";".

tests/test-status-color.t

@@ -399,9 +399,16 color coding of error message with curre
 color coding of error message without curses
 
   $ echo 'raise ImportError' > curses.py
+#if windows
+  $ PYTHONPATH="`pwd`;$PYTHONPATH" hg unknowncommand > /dev/null
+  hg: unknown command 'unknowncommand'
+  (use 'hg help' for a list of commands)
+  [10]
+#else
   $ PYTHONPATH=`pwd`:$PYTHONPATH hg unknowncommand > /dev/null
   hg: unknown command 'unknowncommand'
   (use 'hg help' for a list of commands)
   [10]
+#endif
 
   $ cd ..