Change from / reply-to for feedback form

If the email address user inputed has forced SPF check, the email will not be received by major ESPs.

qa-include/pages/feedback.php

@@ -89,8 +89,10 @@
 				);
 
 				if (qa_send_email(array(
-					'fromemail' => qa_email_validate(@$inemail) ? $inemail : qa_opt('from_email'),
+					'fromemail' => qa_opt('from_email'),
 					'fromname' => $inname,
+					'replytoemail' => qa_email_validate(@$inemail) ? $inemail : null,
+					'replytoname' => $inname,
 					'toemail' => qa_opt('feedback_email'),
 					'toname' => qa_opt('site_title'),
 					'subject' => qa_lang_sub('emails/feedback_subject', qa_opt('site_title')),
@@ -182,4 +184,4 @@
 
 /*
 	Omit PHP closing tag to help avoid accidental output
-*/
\ No newline at end of file
+*/