MDL-74631 mod_lti: Remove </img>

Remove illegal HTML tag.

Added example context to pass CI checks.

mod/lti/templates/tool_proxy_card.mustache

@@ -39,6 +39,23 @@
     * description
     * instancecount
 
+    Example context (json):
+    {
+        "id": 1,
+        "name": "Test Tool",
+        "urls": {
+            "edit": "https://moodle.example.com/mod/lti/registersettings.php",
+            "icon": "https://moodle.example.com/theme/image.php/boost/lti/-1/icon"
+        },
+        "state": {
+            "text": "Accepted",
+            "configured": false,
+            "pending": false,
+            "rejected": false,
+            "accepted": true,
+            "unknown": false
+        }
+    }
 }}
 <div class="tool-card" data-proxy-id="{{id}}">
     <div class="overlay-container">
@@ -69,7 +86,7 @@
                     <a class="delete" href="#" title="{{#str}} delete {{/str}}">{{#pix}} t/delete, core, {{#str}} delete {{/str}}{{/pix}}</a>
                 </div>
             </div>
-            <img class="tool-card-icon" src="{{{urls.icon}}}" alt="{{name}}"></img>
+            <img class="tool-card-icon" src="{{{urls.icon}}}" alt="{{name}}">
             <div class="contenteditable-container">
                 <h4 class="name">{{name}}</h4>
                 <div class="overlay-container">{{> mod_lti/loader }}</div>