'main': Don't progress the $in_redirection staller while $in_param.

Fixes #712.

highlighters/main/main-highlighter.zsh

@@ -617,7 +617,7 @@ _zsh_highlight_main_highlighter_highlight_list()
     if (( in_redirection == 0 )); then
       this_word=$next_word
       next_word=':regular:'
-    else
+    elif (( !in_param )); then
       # Stall $next_word.
       (( --in_redirection ))
     fi

highlighters/main/test-data/redirection-from-param.zsh

@@ -35,6 +35,6 @@ BUFFER=$'<$fn cat'
 
 expected_region_highlight=(
   '1 1 redirection' # <
-  '2 4 path "issue #712"' # $fn
-  '6 8 command "issue #712"' # cat
+  '2 4 path' # $fn
+  '6 8 command' # cat
 )