Remove "Try the new MeshCentral UI" and fix footer in modern UI (#7395)

* remove new UI prompt from the default3 template

* enhance footer styles and update visibility in default3 template

public/styles/style-bootstrap.css

@@ -472,16 +472,13 @@ body {
 }
 
 #footer {
-    -ms-grid-column: 2;
-    -ms-grid-row: 4;
-    grid-area: footer;
-    clear: both;
-    overflow: auto;
+    position: fixed;
+    bottom: 0;
+    left: 0;
     width: 100%;
-    text-align: center;
     background-color: #113962;
-    padding-top: 5px;
-    padding-bottom: 5px;
+    padding: 5px 0;
+    text-align: center;
 }
 
 .fulldesk #footer {

views/default3.handlebars

@@ -160,9 +160,6 @@
             </div>
             <p id="logoutControl"><span id=logoutControlSpan class="logoncontrolspan"></span><span id=idleTimeoutNotify
                     style="color:yellow"></span></p>
-            <div class=textnewui id=textnewui onmouseup=toggleBootstrapUIMode() onkeypress="if (event.key=='Enter') { toggleBootstrapUIMode(); }">
-                <b>Try the new MeshCentral UI</b>
-            </div>
         </div>
         <div class="sidebar flex-column" id="page_leftbar">
             <div style="height:24px"></div>
@@ -1667,7 +1664,7 @@
         </div>
         <div id="footer">
             <div class="footer1">{{{footer}}}</div>
-            <div class="footer2" style="display:none;">
+            <div class="footer2">
                 <div class="row">
                     <div class="col-md-6 d-flex gap-2">
                     </div>