FIX(client): Prevent unchecking both ACL context checkboxes

Previously, it was possible to have both context checkboxes
disabled in the ACLEditor, leaving the ACL entry in a dangleing
inactive state.
This commit makes sure, that at least one of the checkboxes is
always enabled.

(cherry picked from commit 55b4de0)

src/mumble/ACLEditor.cpp

@@ -827,18 +827,26 @@ void ACLEditor::on_qcbACLInherit_clicked(bool) {
 
 void ACLEditor::on_qcbACLApplyHere_clicked(bool checked) {
 	ChanACL *as = currentACL();
-	if (!as || as->bInherited)
+	if (!as || as->bInherited) {
 		return;
+	}
 
 	as->bApplyHere = checked;
+	if (!checked && !qcbACLApplySubs->isChecked()) {
+		qcbACLApplySubs->setCheckState(Qt::Checked);
+	}
 }
 
 void ACLEditor::on_qcbACLApplySubs_clicked(bool checked) {
 	ChanACL *as = currentACL();
-	if (!as || as->bInherited)
+	if (!as || as->bInherited) {
 		return;
+	}
 
 	as->bApplySubs = checked;
+	if (!checked && !qcbACLApplyHere->isChecked()) {
+		qcbACLApplyHere->setCheckState(Qt::Checked);
+	}
 }
 
 void ACLEditor::qcbACLGroup_focusLost() {