CRM-19153 BUg fixes for non editable fields

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* CRM-19153: Future pledge start date causes improper future pledge payment dates
  https://issues.civicrm.org/jira/browse/CRM-19153

CRM/Contribute/Form/Contribution/Confirm.php

@@ -1948,7 +1948,8 @@ protected function processFormSubmission($contactID) {
     // CRM-18854
     if (CRM_Utils_Array::value('adjust_recur_start_date', $this->_values)) {
       $pledgeBlock = CRM_Pledge_BAO_PledgeBlock::getPledgeBlock($this->_id);
-      if (CRM_Utils_Array::value('start_date', $this->_params) || !CRM_Utils_Array::value('is_pledge_start_date_visible', $pledgeBlock)) {
+      if (CRM_Utils_Array::value('start_date', $this->_params) || !CRM_Utils_Array::value('is_pledge_start_date_visible', $pledgeBlock)
+          || !CRM_Utils_Array::value('is_pledge_start_date_editable', $pledgeBlock)) {
         $pledgeStartDate = CRM_Utils_Array::value('start_date', $this->_params, NULL);
         $this->_params['receive_date'] = CRM_Pledge_BAO_Pledge::getPledgeStartDate($pledgeStartDate, $pledgeBlock);
         $recurParams = CRM_Pledge_BAO_Pledge::buildRecurParams($this->_params);