42364: _git: fix __git_ignore_line to ignore the current word

Before this patch "git branch -d master<tab>" would result in
"no matches found", while "master" itself should get completed here.

The "(bQ)" (added in 527badc23, via 38129?!) does not seem to be necessary
anymore: with files "f\[a-z\]o" and "foo", "git add f[a-z]o <tab>"
offers "f\[a-z\]o", but not "foo".

Completion/Unix/Command/_git

@@ -5596,12 +5596,7 @@ __git_describe_commit () {
 # .
 (( $+functions[__git_ignore_line] )) ||
 __git_ignore_line () {
-  declare -a ignored
-  ignored=()
-  ((CURRENT > 1)) &&
-    ignored+=(${(bQ)line[1,CURRENT-1]})
-  ((CURRENT < $#line)) &&
-    ignored+=(${(bQ)line[CURRENT+1,-1]})
+  local -a ignored=(${line:#${words[CURRENT]}})
   $* -F ignored
 }