Fix PHP Deprecation Notice

Deprecation Notice: Unparenthesized `a ?: b ? c : d` is deprecated. Use either `(a ?: b) ? c : d` or `a ?: (b ? c : d)`

Author: tortuetorche

src/Efficiently/JqueryLaravel/helpers.php

@@ -60,7 +60,7 @@ function form_for($model, array $options = [])
         }
 
         if (! array_get($options, 'class')) {
-            $prefix = $prefix ?: $model->exists ? 'edit' : 'create';
+            $prefix = $prefix ?: ($model->exists ? 'edit' : 'create');
             $options['class'] = dom_class($model, $prefix);
         }
 
@@ -121,7 +121,7 @@ function former_for($model, array $options = [])
             }
 
             if (! array_get($options, 'class')) {
-                $prefix = $prefix ?: $model->exists ? 'edit' : 'create';
+                $prefix = $prefix ?: ($model->exists ? 'edit' : 'create');
                 $options['class'] = dom_class($model, $prefix);
             }