Remove remaining HAVE_INPUT ifdef sections

Somehow they sneaked in between creating the patch for making libinput
mandatory and pushing the patch.

input.cpp

@@ -1873,11 +1873,9 @@ bool InputRedirection::hasAlphaNumericKeyboard()
 
 bool InputRedirection::hasTabletModeSwitch()
 {
-#if HAVE_INPUT
     if (m_libInput) {
         return m_libInput->hasTabletModeSwitch();
     }
-#endif
     return false;
 }
 

tabletmodemanager.cpp

@@ -49,11 +49,9 @@ TabletModeInputEventSpy::TabletModeInputEventSpy(TabletModeManager *parent)
 
 void TabletModeInputEventSpy::switchEvent(SwitchEvent *event)
 {
-#if HAVE_INPUT
     if (!event->device()->isTabletModeSwitch()) {
         return;
     }
-#endif
 
     switch (event->state()) {
     case SwitchEvent::State::Off: