Fix liquidprompt#416

With 50ace41 I broke _lp_title as the
TITLE_OPEN/TITLE_CLOSE had content that required expansion (echo -e).
This caused an issue only on zsh because for bash \e in PS1 was
expanded (not in zsh because escape sequences use '%' instead of '\').
The issue is now fixed by using raw bytes in TITLE_OPEN/TITLE_CLOSE.
(Thanks to pkkolos for also noticing the issue and reporting it)

liquidprompt

@@ -284,13 +284,13 @@ if [[ "$TERM" == screen* ]]; then
     LP_BRACKET_OPEN="${LP_COLOR_IN_MULTIPLEXER}${LP_MARK_BRACKET_OPEN}${NO_COL}"
     LP_BRACKET_CLOSE="${LP_COLOR_IN_MULTIPLEXER}${LP_MARK_BRACKET_CLOSE}${NO_COL}"
     (( LP_ENABLE_TITLE = LP_ENABLE_TITLE && LP_ENABLE_SCREEN_TITLE ))
-    LP_TITLE_OPEN="\033k"
-    LP_TITLE_CLOSE="\033\\"
+    LP_TITLE_OPEN="$(printf '\033k')"
+    LP_TITLE_CLOSE="$(printf '\033\\')"
 else
     LP_BRACKET_OPEN="${LP_MARK_BRACKET_OPEN}"
     LP_BRACKET_CLOSE="${LP_MARK_BRACKET_CLOSE}"
-    LP_TITLE_OPEN="\e]0;"
-    LP_TITLE_CLOSE="\a"
+    LP_TITLE_OPEN="$(printf '\e]0;')"
+    LP_TITLE_CLOSE="$(printf '\a')"
 fi
 
 [[ "_$TERM" == _linux* ]] && LP_ENABLE_TITLE=0