Fix tutorial key.

SDL2 causes the key char to be '/' instead of '?'.
This is a known issue when updating libtcod versions.

Author: HexDecimal

src/screen_game.cpp

@@ -250,7 +250,7 @@ bool Game::update(float elapsed, TCOD_key_t &k,TCOD_mouse_t &mouse) {
 	if ( finalExplosion <= 1.0f ) finalExplosion -= elapsed/finalExplosionTime;
 
 
-	if ( helpOn && (k.c == '?' || k.c == ' ') && ! k.pressed ) {
+	if ( helpOn && (k.c == '/' || k.c == ' ') && ! k.pressed ) {
 		helpOn=false;
 		resumeGame();
 		return true;

src/ui_tuto.cpp

@@ -372,9 +372,9 @@ bool Tutorial::update(float elapsed, TCOD_key_t &k,TCOD_mouse_t &mouse) {
 				pages[id].con->setCharForeground(w-1,0,TCODColor::lightGrey);
 			}
 			if ( (mouse.lbutton_pressed && mouse.cx == x + w - 1 && mouse.cy == y )
-				|| (!k.pressed && (k.c == '?' || k.c ==' ' || k.vk == TCODK_ESCAPE )) || tutoElapsed > pages[id].delay ) {
+				|| (!k.pressed && (k.c == '/' || k.c ==' ' || k.vk == TCODK_ESCAPE )) || tutoElapsed > pages[id].delay ) {
 				if (renderMenu) gameEngine->gui.setMode(GUI_NONE);
-				else if ( k.c != '?') closeLiveTuto();
+				else if ( k.c != '/') closeLiveTuto();
 				else gameEngine->gui.setMode(GUI_TUTORIAL);
 			}
 			if ( renderMenu && menu.size() > 1 && fadeOutDelay == 0.0f ) {
@@ -394,7 +394,7 @@ bool Tutorial::update(float elapsed, TCOD_key_t &k,TCOD_mouse_t &mouse) {
 				setNewPage(id);
 			}
 		}
-	} else if ( k.c == '?' && ! k.pressed ) {
+	} else if ( k.c == '/' && ! k.pressed ) {
 		gameEngine->gui.setMode(GUI_TUTORIAL);
 	}
 	return true;