MAPG-137 add width and height to images where possible

views/templates/header.php

@@ -1,7 +1,7 @@
 <div class="header">
     <h1>
         <a href="/" title="MapGuesser">
-            <img class="inline" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>">
+            <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>">
             MapGuesser
         </a>
     </h1>

views/templates/main_header.php

@@ -23,7 +23,7 @@
 </head>
 <body>
     <div id="loading">
-        <img src="<?= $_ENV['STATIC_ROOT'] ?>/img/loading.svg?rev=<?= REVISION ?>">
+        <img src="<?= $_ENV['STATIC_ROOT'] ?>/img/loading.svg?rev=<?= REVISION ?>" width="64" height="64">
     </div>
     <div id="cover"></div>
     <div id="modal" class="modal">