bash completion: 'git apply' should use 'fix' not 'strip'

Bring completion up to date with the man page.
Signed-off-by: NEric Raible <raible@gmail.com>
Acked-by: NShawn O. Pearce <spearce@spearce.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -501,7 +501,7 @@ __git_has_doubledash ()
 	return 1
 }
 
-__git_whitespacelist="nowarn warn error error-all strip"
+__git_whitespacelist="nowarn warn error error-all fix"
 
 _git_am ()
 {