'main': Path separators: Leave styles empty by default

If the separator feature is disabled, this makes it possible to
change the main 'path' styles in a running session without the
need to touch the '_pathseparator' styles, too.

Author: m0vie

highlighters/main/main-highlighter.zsh

@@ -41,9 +41,9 @@
 : ${ZSH_HIGHLIGHT_STYLES[commandseparator]:=none}
 : ${ZSH_HIGHLIGHT_STYLES[hashed-command]:=fg=green}
 : ${ZSH_HIGHLIGHT_STYLES[path]:=underline}
-: ${ZSH_HIGHLIGHT_STYLES[path_pathseparator]:=${ZSH_HIGHLIGHT_STYLES[path]}}
+: ${ZSH_HIGHLIGHT_STYLES[path_pathseparator]:=}
 : ${ZSH_HIGHLIGHT_STYLES[path_prefix]:=underline}
-: ${ZSH_HIGHLIGHT_STYLES[path_prefix_pathseparator]:=${ZSH_HIGHLIGHT_STYLES[path_prefix]}}
+: ${ZSH_HIGHLIGHT_STYLES[path_prefix_pathseparator]:=}
 : ${ZSH_HIGHLIGHT_STYLES[globbing]:=fg=blue}
 : ${ZSH_HIGHLIGHT_STYLES[history-expansion]:=fg=blue}
 : ${ZSH_HIGHLIGHT_STYLES[single-hyphen-option]:=none}