allow tarteaucitronAlertSmall to be at top when orientation is set to top.

On mobile, when Adsense Auto Ads is in use, and orientation to bottom, the small alert should be behind ads.
This allow alert to be at top and unhide it.

css/tarteaucitron.css

@@ -364,9 +364,17 @@
 /***
  * Small alert
  */
+
+.tarteaucitronAlertSmallTop {
+    top: 0;
+}
+
+.tarteaucitronAlertSmallBottom {
+    bottom: 0;
+}
+
 #tarteaucitronAlertSmall {
     background: #333;
-    bottom: 0;
     display: none;
     padding: 0;
     position: fixed;
@@ -542,4 +550,4 @@ ins.ferank-publicite, ins.adsbygoogle {
 div.amazon_product {
     height:240px;
     width:120px;
-}
+}

tarteaucitron.js

@@ -296,7 +296,7 @@ var tarteaucitron = {
                 }
                 
                 if (defaults.showAlertSmall === true) {
-                    html += '<div id="tarteaucitronAlertSmall">';
+                    html += '<div id="tarteaucitronAlertSmall" class="tarteaucitronAlertSmall' + orientation + '">';
                     html += '   <div id="tarteaucitronManager" onclick="tarteaucitron.userInterface.openPanel();">';
                     html += '       ' + tarteaucitron.lang.alertSmall;
                     html += '       <div id="tarteaucitronDot">';