Revert "Member avatars without canvas" (#10057

* Revert "Apply more general fix for base avatar regressions (#10045)"

This reverts commit 371a3c0d36.

* Revert "Fix layout and visual regressions around default avatars (#10031)"

This reverts commit 0d1fce37b2.

* Revert "Member avatars without canvas (#9990)"

This reverts commit a8aa4de4b4.

* Update snapshots

test/components/views/beacon/__snapshots__/BeaconMarker-test.tsx.snap

@@ -13,17 +13,23 @@ exports[`<BeaconMarker /> renders marker when beacon has location 1`] = `
         <span
           class="mx_BaseAvatar"
           role="presentation"
-          style="width: 36px; height: 36px;"
         >
           <span
             aria-hidden="true"
-            class="mx_BaseAvatar_image mx_BaseAvatar_initial"
-            data-testid="avatar-img"
-            style="background-color: rgb(172, 59, 168); width: 36px; height: 36px; font-size: 23.400000000000002px; line-height: 36px;"
-            title="@alice:server"
+            class="mx_BaseAvatar_initial"
+            style="font-size: 23.400000000000002px; width: 36px; line-height: 36px;"
           >
             A
           </span>
+          <img
+            alt=""
+            aria-hidden="true"
+            class="mx_BaseAvatar_image"
+            data-testid="avatar-img"
+            src="data:image/png;base64,00"
+            style="width: 36px; height: 36px;"
+            title="@alice:server"
+          />
         </span>
       </div>
     </div>