repo: capitalize default prompt char

It is common in command line tools to indicate what the default answer
will be if the user simply hits enter.  In repo, the display is just
"y/n" with no indication as to which is the default.  So change the n
to N in the messages since that is how repo operates.

Change-Id: I81819ae630355072eb0365e59168b0921289498f
diff --git a/subcmds/init.py b/subcmds/init.py
index 9214aed..1c23d62 100644
--- a/subcmds/init.py
+++ b/subcmds/init.py
@@ -189,7 +189,7 @@
 
       print ''
       print 'Your identity is: %s <%s>' % (name, email)
-      sys.stdout.write('is this correct [y/n]? ')
+      sys.stdout.write('is this correct [y/N]? ')
       a = sys.stdin.readline().strip()
       if a in ('yes', 'y', 't', 'true'):
         break
@@ -231,7 +231,7 @@
       out.printer(fg='black', attr=c)(' %-6s ', c)
     out.nl()
 
-    sys.stdout.write('Enable color display in this user account (y/n)? ')
+    sys.stdout.write('Enable color display in this user account (y/N)? ')
     a = sys.stdin.readline().strip().lower()
     if a in ('y', 'yes', 't', 'true', 'on'):
       gc.SetString('color.ui', 'auto')