Fix condition in set-title-precmd

Fix the if condition inside set-title-precmd to not do anything if
':omz:terminal' autotitle is not true. There is a bug in the original
version where if the user sets autotitle to false the else condition is
automatically executed. This causes OSX escape commands to be printed to
the terminal on non-OSX systems.

terminal.zsh

@@ -78,7 +78,8 @@ autoload -Uz add-zsh-hook
 
 # Sets the tab and window titles before the prompt is displayed.
 function set-title-precmd {
-  if [[ "$TERM_PROGRAM" != "Apple_Terminal" ]] && zstyle -t ':omz:terminal' auto-title; then
+  if zstyle -t ':omz:terminal' auto-title; then
+    if [[ "$TERM_PROGRAM" != "Apple_Terminal" ]]; then
       set-window-title "${(%):-%~}"
       for kind in tab screen; do
         # Left-truncate the current working directory to 15 characters.
@@ -88,6 +89,7 @@ function set-title-precmd {
       # Set Apple Terminal current working directory.
       printf '\e]7;%s\a' "file://$HOST${PWD// /%20}"
     fi
+  fi
 }
 add-zsh-hook precmd set-title-precmd