Remove CSS override for event line on thread view (#7141)

Author: germain-gg

res/css/views/rooms/_EventTile.scss

@@ -857,10 +857,6 @@ $left-gutter: 64px;
             order: 10 !important;
         }
 
-        &:hover .mx_EventTile_line {
-            padding-left: 0 !important;
-        }
-
         .mx_MessageTimestamp {
             left: auto;
             right: 2px !important;