main: in arguments starting with %?, ? is not a glob

Fixes #596

highlighters/main/main-highlighter.zsh

@@ -984,6 +984,11 @@ _zsh_highlight_main_highlighter_highlight_argument()
   local MATCH; integer MBEGIN MEND
 
   case "$arg[i]" in
+    '%')
+      if [[ $arg[i+1] == '?' ]]; then
+        (( i += 2 ))
+      fi
+      ;;
     '-')
       if (( option_eligible )); then
         if [[ $arg[i+1] == - ]]; then

highlighters/main/test-data/jobsubst-isnt-glob.zsh

@@ -30,9 +30,8 @@
 
 BUFFER=$': %? %?foo'
 
-expected_mismatch="fallout of issue #596"
 expected_region_highlight=(
   '1 1 builtin' # :
   '3 4 default' # %?
-  '6 10 default "issue 596"' # %?foo
+  '6 10 default' # %?foo
 )