_parse_help: Fix --foo={bar,quux} handling.

bash_completion

@@ -759,7 +759,7 @@ _parse_help()
                  if ($i !~ /^-/) { break }
              }
              if (x == -1) { x = 1 }
-             sub("[=<[].*", "", $x);
+             sub("[=<{[].*", "", $x);
              print $x
          }'
 }

test/unit/_parse_help.exp

@@ -85,5 +85,9 @@ set cmd {fn() { printf '%s\n' "--foo=<bar>"; }; _parse_help fn}
 assert_bash_list "--foo" $cmd "long with value in angle brackets"
 sync_after_int
 
+set cmd {fn() { printf '%s\n' "--foo={bar,quux}"; }; _parse_help fn}
+assert_bash_list "--foo" $cmd "long with value in curly brackets"
+sync_after_int
+
 
 teardown