Fix instructor feedback not being given when showPartialCorrectAnswer…

…s is false.

This applies to problems rendered in the library browser or PG problem
editor.  In that case if $showPartialCorrectAnswers is false, then the
instructor is not given the problem status (correct/incorrect) in the
feedback.  This is because the renderProblem method does not set the
forceShowAttemptResults (which overrides the $showPartialCorrectAnswers
variable in PG) options.  So that is fixed by setting that option from
the submit buttons for instructors.

lib/WebworkWebservice/RenderProblem.pm

@@ -233,7 +233,8 @@ async sub renderProblem {
 		showAttemptPreviews      => $rh->{showAttemptPreviews}
 			// ($rh->{preview} || $rh->{WWsubmit} || $rh->{WWcorrectAns}),
 		showAttemptResults      => $rh->{showAttemptResults} // ($rh->{WWsubmit} || $rh->{WWcorrectAns}),
-		forceShowAttemptResults => $rh->{forceShowAttemptResults},
+		forceShowAttemptResults => $rh->{forceShowAttemptResults} || ($rh->{isInstructor}
+			&& ($rh->{showAttemptResults} // ($rh->{WWsubmit} || $rh->{WWcorrectAns}))),
 		showMessages       => $rh->{showMessages}       // ($rh->{preview} || $rh->{WWsubmit} || $rh->{WWcorrectAns}),
 		showCorrectAnswers => $rh->{showCorrectAnswers} // $rh->{WWcorrectAns},
 		debuggingOptions   => {