MTA-2319: [PS] Backend module functional tests maintenance

- Corrected set value for global search element

Author: Dmytro Bursak

dev/tests/functional/lib/Magento/Mtf/Client/Element/GlobalsearchElement.php

@@ -14,11 +14,6 @@
  */
 class GlobalsearchElement extends SimpleElement
 {
-    /**
-     * "Backspace" key code.
-     */
-    const BACKSPACE = "\xEE\x80\x83";
-
     /**
      * Search icon selector.
      *
@@ -67,24 +62,10 @@ public function setValue($value)
         if (!$this->find($this->searchInput)->isVisible()) {
             $this->find($this->searchIcon)->click();
         }
-        $this->clear();
-        $this->find($this->searchInput)->setValue($value);
+        $this->find($this->searchInput)->keys(str_split($value));
         $this->waitResult();
     }
 
-    /**
-     * Clear value of element.
-     *
-     * @return void
-     */
-    protected function clear()
-    {
-        $element = $this->find($this->searchInput);
-        while ('' != $element->getValue()) {
-            $element->setValue([self::BACKSPACE]);
-        }
-    }
-
     /**
      * Wait init search suggest container.
      *