Fix double expansion of prompt variables

powerlevel9k.zsh-theme

@@ -1282,8 +1282,8 @@ powerlevel9k_prepare_prompts() {
   _P9K_TIMER_START=99999999999
 
   if [[ "$POWERLEVEL9K_PROMPT_ON_NEWLINE" == true ]]; then
-    PROMPT="$(print_icon 'MULTILINE_FIRST_PROMPT_PREFIX')%f%b%k$(build_left_prompt)
-$(print_icon 'MULTILINE_SECOND_PROMPT_PREFIX')"
+    PROMPT='$(print_icon 'MULTILINE_FIRST_PROMPT_PREFIX')%f%b%k$(build_left_prompt)
+$(print_icon 'MULTILINE_SECOND_PROMPT_PREFIX')'
     if [[ "$POWERLEVEL9K_RPROMPT_ON_NEWLINE" != true ]]; then
       # The right prompt should be on the same line as the first line of the left
       # prompt. To do so, there is just a quite ugly workaround: Before zsh draws
@@ -1298,13 +1298,13 @@ $(print_icon 'MULTILINE_SECOND_PROMPT_PREFIX')"
       RPROMPT_SUFFIX=''
     fi
   else
-    PROMPT="%f%b%k$(build_left_prompt)"
+    PROMPT='%f%b%k$(build_left_prompt)'
     RPROMPT_PREFIX=''
     RPROMPT_SUFFIX=''
   fi
 
   if [[ "$POWERLEVEL9K_DISABLE_RPROMPT" != true ]]; then
-    RPROMPT="$RPROMPT_PREFIX%f%b%k$(build_right_prompt)%{$reset_color%}$RPROMPT_SUFFIX"
+    RPROMPT='$RPROMPT_PREFIX%f%b%k$(build_right_prompt)%{$reset_color%}$RPROMPT_SUFFIX'
   fi
 NEWLINE='
 '