update writable deploy recipe to use release_or_current_path (#3449)

Updating this task to use release_or_current_path (from #2486)  will allow the writable task to be used outside of deployment

recipe/deploy/writable.php

@@ -72,7 +72,7 @@
         throw new \RuntimeException('Absolute path not allowed in config parameter `writable_dirs`.');
     }
 
-    cd('{{release_path}}');
+    cd('{{release_or_current_path}}');
 
     // Create directories if they don't exist
     run("mkdir -p $dirs");