GameConfig: Fix css assets

public/src/views/game.html

@@ -1,6 +1,6 @@
 <div id="game">
 	<div id="touch-drum">
-		<img id="touch-drum-img" src="/assets/img/touch_drum.png">
+		<div id="touch-drum-img"></div>
 	</div>
 	<canvas id="canvas"></canvas>
 	<div id="pause-menu">
@@ -11,7 +11,7 @@
 		</div>
 	</div>
 	<div id="touch-buttons">
-		<img id="touch-full-btn" src="/assets/img/touch_fullscreen.png"><img id="touch-pause-btn" src="/assets/img/touch_pause.png">
+		<div id="touch-full-btn"></div><div id="touch-pause-btn"></div>
 	</div>
 	<div id="cursor"></div>
 </div>

public/src/views/loadsong.html

@@ -1,6 +1,6 @@
 <div id="load-song">
 	<div id="loading-song">
-		<img id="loading-don" src="/assets/img/dancing-don.gif">
+		<div id="loading-don"></div>
 		<div class="loading-text stroke-sub" alt="Loading...">Loading...</div>
 	</div>
 </div>

public/src/views/songselect.html

@@ -1,5 +1,5 @@
 <div id="song-select">
 	<canvas id="song-sel-canvas"></canvas>
 	<div id="song-sel-selectable" tabindex="1"></div>
-	<img id="touch-full-btn" src="/assets/img/touch_fullscreen.png">
+	<div id="touch-full-btn"></div>
 </div>

public/src/views/titlescreen.html

@@ -1,4 +1,4 @@
 <div id="title-screen">
-	<img class="logo-big" src="/assets/img/logo-big.png" alt="太鼓の達人ウェブ">
+	<div class="logo-big">太鼓の達人ウェブ</div>
 	<div class="click-to-continue stroke-sub" alt="Click or Press Enter!">Click or Press Enter!</div>
 </div>