fix image gen for read users

Author: neckaros

src/model/medias.rs

@@ -2229,7 +2229,7 @@ impl ModelController {
             &None,
             &None,
             thumb.as_slice(),
-            requesting_user,
+            &ConnectedUser::ServerAdmin,
         )
         .await?;
 

src/model/mod.rs

@@ -431,7 +431,7 @@ impl ModelController {
                             &kind,
                             &size,
                             image.as_slice(),
-                            requesting_user,
+                            &ConnectedUser::ServerAdmin,
                         )
                         .await?;