Convert application template fields to use mat-label

- Change from placeholder to mat-label for Name, URL, Icon Path
- Consistent with other form fields across the application

Author: sei-awelle

src/app/components/admin-app/admin-app-template-search/admin-template-details/admin-template-details.component.html

@@ -5,29 +5,29 @@
 
 <div class="d-flex flex-column">
   <mat-form-field>
+    <mat-label>Name</mat-label>
     <input
       matInput
-      placeholder="Name"
       tabIndex="1"
       name="name"
       [(ngModel)]="appTemplate.name"
       (change)="editAppTemplate()"
     />
   </mat-form-field>
   <mat-form-field>
+    <mat-label>URL</mat-label>
     <input
       matInput
-      placeholder="Url"
       tabIndex="2"
       name="url"
       [(ngModel)]="appTemplate.url"
       (change)="editAppTemplate()"
     />
   </mat-form-field>
   <mat-form-field>
+    <mat-label>Icon Path</mat-label>
     <input
       matInput
-      placeholder="icon"
       tabIndex="3"
       name="icon"
       [(ngModel)]="appTemplate.icon"