Move mx_MessageTimestamp out of mx_EventTile:not([data-layout=bubble]) on TimelineCard (#8937)

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

res/css/views/right_panel/_TimelineCard.scss

@@ -51,7 +51,6 @@ limitations under the License.
             }
 
             .mx_EventTile_avatar {
-                position: absolute; // for IRC layout
                 inset-inline-start: -3px;
             }
 
@@ -74,6 +73,10 @@ limitations under the License.
                 max-width: unset;
             }
 
+            .mx_MessageTimestamp {
+                inset-inline: auto 0;
+            }
+
             .mx_ReactionsRow {
                 margin-inline-end: $spacing-8; // See: var(--ThreadView_group_spacing-end) for ReactionsRow on _EventTile.scss
             }
@@ -84,6 +87,13 @@ limitations under the License.
             }
         }
 
+        &[data-layout=irc] {
+            .mx_EventTile_avatar,
+            .mx_MessageTimestamp {
+                position: absolute;
+            }
+        }
+
         &[data-layout=bubble] {
             &::before {
                 z-index: auto; // enable background color on hover
@@ -97,14 +107,6 @@ limitations under the License.
                 position: relative; // display on hover
             }
         }
-
-        &:not([data-layout="bubble"]) {
-            .mx_MessageTimestamp {
-                position: absolute; // for modern layout and IRC layout
-                inset-inline-start: auto;
-                inset-inline-end: 0;
-            }
-        }
     }
 
     .mx_EventTile,