shellIntegration.fish: escape the value of $PWD

Author: rwe

src/vs/workbench/contrib/terminal/browser/media/shellIntegration.fish

@@ -63,7 +63,7 @@ end
 # Sent whenever a new fish prompt is about to be displayed.
 # Updates the current working directory.
 function __vsc_update_cwd --on-event fish_prompt
-	__vsc_esc P "Cwd=$PWD"
+	__vsc_esc P "Cwd=$(__vsc_escape_value "$PWD")"
 
 	# If a command marker exists, remove it.
 	# Otherwise, the commandline is empty and no command was run.