Added mute shortcut.

src/include/86box/86box.h

@@ -242,7 +242,7 @@ struct accelKey {
 	char desc[64];
 	char seq[64];
 };
-#define NUM_ACCELS 7
+#define NUM_ACCELS 8
 extern struct accelKey acc_keys[NUM_ACCELS];
 extern struct accelKey def_acc_keys[NUM_ACCELS];
 extern int FindAccelerator(const char *name);

src/qt/qt_mainwindow.cpp

@@ -1397,7 +1397,7 @@ MainWindow::eventFilter(QObject *receiver, QEvent *event)
 			}
 			if ((QKeySequence)(ke->key() | ke->modifiers()) == FindAcceleratorSeq("mute"))
 			{
-				ui->actionMute_Unmute->setShortcut(seq);
+				ui->actionMute_Unmute->trigger();
 			}
 
 			return true;