refactor(plugin): php mess detector violations

Solved:

* Avoid unused parameters
* Avoid unused local variables

#taskid: 19424

lib.php

@@ -26,9 +26,8 @@
 class tinymce_tiny_mce_wiris extends editor_tinymce_plugin {
     protected $buttons = array('tiny_mce_wiris_formulaEditor', 'tiny_mce_wiris_CAS');
 
-    protected function update_init_params(array &$params, context $context,
-                                          array $options = null) {
-        global $PAGE, $CFG, $COURSE;
+    protected function update_init_params(array &$params, context $context) {
+        global $PAGE, $COURSE;
         // We need to know if MathType filter are active in the context of the course.
         // If not MathTYPe filter should be disabled.
 
@@ -68,10 +67,10 @@ protected function update_init_params(array &$params, context $context,
 
         // Add button after emoticon button in advancedbuttons3.
         if ($editorisactive) {
-            $added = $this->add_button_after($params, 3, 'tiny_mce_wiris_formulaEditor', '', false);
+            $this->add_button_after($params, 3, 'tiny_mce_wiris_formulaEditor', '', false);
         }
         if ($chemistryisactive) {
-            $added = $this->add_button_after($params, 3, 'tiny_mce_wiris_formulaEditorChemistry', '', false);
+            $this->add_button_after($params, 3, 'tiny_mce_wiris_formulaEditorChemistry', '', false);
         }
         // Add JS file using 'plugin.min.js' instead of default name.
         $this->add_js_plugin($params);