Fix style for password pop-up and mustache template fix.

styles.css

@@ -186,8 +186,9 @@
 .path-mod-attendance .attreport .narrow {
     width: 1px;
 }
-.path-mod-attendance .student-pass {
+.path-mod-attendance .student-password {
     font-size: x-large;
+    text-align: center;
 }
 #page-mod-attendance-sessions .statusgroup .statusdesc {
     margin-right: 12px;

templates/attendance_password_icon.mustache

@@ -10,9 +10,8 @@
         "linktext": "",
         "icon":{
             "attributes": [
-                {"name": "class", "value": "iconhelp"},
+                {"name": "src", "value": "../pix/key.svg"},
-                {"name": "src", "value": "../../../pix/help.svg"},
+                {"name": "alt", "value": "Password icon"}
-                {"name": "alt", "value": "Help icon"}
             ]
         }
     }