GUACAMOLE-773: Remove use of XHTML-style self-closing tags from normal HTML.

This is particularly important for AngularJS 1.8.x and jQuery 3.5.0+,
which will no longer correct this automatically with their HTML
prefilters, resulting in unexpected nesting of tags when the browser
interprets something like "<div/>" as "<div>" (older versions of jQuery
would have corrected "<div/>" to "<div></div>").

See:

 * https://docs.angularjs.org/guide/migration#migrating-from-1-7-to-1-8
 * https://jquery.com/upgrade-guide/3.5/

extensions/guacamole-auth-quickconnect/src/main/resources/templates/quickconnectField.html

@@ -1,8 +1,8 @@
-<meta name="before" content=".all-connections" />
+<meta name="before" content=".all-connections">
 <div class="quickconnect-list-item list-item" ng-controller="quickconnectController">
     <div class="quickconnect-container">
         <form ng-submit="quickConnect()">
-            <input type=text class="quickconnect-field" placeholder="{{'QUICKCONNECT.FIELD_PLACEHOLDER_URI' |translate}}" ng-model="uri" />
+            <input type=text class="quickconnect-field" placeholder="{{'QUICKCONNECT.FIELD_PLACEHOLDER_URI' |translate}}" ng-model="uri">
         </form>
     </div>
     <div class="action-buttons">

extensions/guacamole-auth-radius/src/main/resources/templates/radiusStateField.html

@@ -1 +1 @@
-<input type="hidden" ng-model="model" />
+<input type="hidden" ng-model="model">

extensions/guacamole-auth-totp/src/main/resources/templates/authenticationCodeField.html

@@ -41,7 +41,7 @@
     <div class="totp-code">
         <input type="text"
                placeholder="{{'TOTP.FIELD_PLACEHOLDER_CODE' |translate}}"
-               ng-model="model" autocorrect="off" autocapitalize="off"/>
+               ng-model="model" autocorrect="off" autocapitalize="off">
     </div>
 
 </div>