[REF] use generic loadStandardSearchOptionsFromUrl

I picked this up as a reviewer's commit of civicrm#13651

That PR is stale but I like to pick out a bit I can get merged when closing a stale pr

CRM/Contact/Form/Search.php

@@ -531,17 +531,14 @@ public function preProcess() {
      * driven by the wizard framework
      */
 
-    $this->_reset = CRM_Utils_Request::retrieve('reset', 'Boolean');
-
-    $this->_force = CRM_Utils_Request::retrieve('force', 'Boolean');
     $this->_groupID = CRM_Utils_Request::retrieve('gid', 'Positive', $this);
     $this->_amtgID = CRM_Utils_Request::retrieve('amtgID', 'Positive', $this);
-    $this->_ssID = CRM_Utils_Request::retrieve('ssID', 'Positive', $this);
     $this->_sortByCharacter = CRM_Utils_Request::retrieve('sortByCharacter', 'String', $this);
     $this->_ufGroupID = CRM_Utils_Request::retrieve('id', 'Positive', $this);
     $this->_componentMode = CRM_Utils_Request::retrieve('component_mode', 'Positive', $this, FALSE, CRM_Contact_BAO_Query::MODE_CONTACTS, $_REQUEST);
     $this->_operator = CRM_Utils_Request::retrieve('operator', 'String', $this, FALSE, CRM_Contact_BAO_Query::SEARCH_OPERATOR_AND, 'REQUEST');
 
+    $this->loadStandardSearchOptionsFromUrl();
     /**
      * set the button names
      */
@@ -559,7 +556,6 @@ public function preProcess() {
     }
 
     // assign context to drive the template display, make sure context is valid
-    $this->_context = CRM_Utils_Request::retrieve('context', 'Alphanumeric', $this, FALSE, 'search');
     if (!CRM_Utils_Array::value($this->_context, self::validContext())) {
       $this->_context = 'search';
     }