[zsh] fix manpath

zsh/path.zsh

@@ -59,6 +59,3 @@ if [[ -f "$rustc" && -x "$rustc" ]] && rust_sysroot="$("$rustc" --print sysroot)
   manpath=("$rust_sysroot/share/man" "${manpath[@]}")
 fi
 unset rustc rust_sysroot
-
-# add colon after MANPATH so that it doesn't overwrite system MANPATH
-MANPATH="$MANPATH:"

zsh/zshrc

@@ -7,6 +7,9 @@ for script in functions path env plugins aliases palette theme; do
   source_if_exists "$ZSH_DOTFILES/custom/$script.zsh"
 done
 
+# add colon after MANPATH so that it doesn't overwrite system MANPATH
+MANPATH="$MANPATH:"
+
 command_exists rbenv && eval "$(rbenv init -)"
 
 BASE16_SHELL_profile_helper="$BASE16_SHELL/profile_helper.sh"