'main': Highlight the 'command' precommand.

Fixes #343.

highlighters/main/main-highlighter.zsh

@@ -240,6 +240,7 @@ _zsh_highlight_highlighter_main_paint()
   # for that precommand.
   local -A precommand_options
   precommand_options=(
+    'command' ''
     'sudo' Cgprtu
   )
 
@@ -261,7 +262,7 @@ _zsh_highlight_highlighter_main_paint()
     # ';;' ';&' ';|'
   )
   ZSH_HIGHLIGHT_TOKENS_PRECOMMANDS=(
-    'builtin' 'command' 'exec' 'nocorrect' 'noglob'
+    'builtin' 'exec' 'nocorrect' 'noglob'
     'pkexec' # immune to #121 because it's usually not passed --option flags
   )
 
@@ -532,14 +533,14 @@ _zsh_highlight_highlighter_main_paint()
      style=reserved-word # de facto a reserved word, although not de jure
      next_word=':start:'
    elif [[ $this_word == *':start:'* ]] && (( in_redirection == 0 )); then # $arg is the command word
-     if [[ -n ${(M)ZSH_HIGHLIGHT_TOKENS_PRECOMMANDS:#"$arg"} ]]; then
-      style=precommand
-     elif (( ${+precommand_options[$arg]} )) && { _zsh_highlight_main__type $arg; [[ -n $REPLY && $REPLY != "none" ]] }; then
+     if (( ${+precommand_options[$arg]} )) && { _zsh_highlight_main__type $arg; [[ -n $REPLY && $REPLY != "none" ]] }; then
       style=precommand
       flags_with_argument=${precommand_options[$arg]}
       next_word=${next_word//:regular:/}
       next_word+=':sudo_opt:'
       next_word+=':start:'
+     elif [[ -n ${(M)ZSH_HIGHLIGHT_TOKENS_PRECOMMANDS:#"$arg"} ]]; then
+      style=precommand
      else
       case $res in
         reserved)       # reserved word