Issue list alignment tweaks (#15483)

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>

web_src/less/shared/issuelist.less

@@ -13,6 +13,7 @@
 
     .issue-item-icon svg {
       margin-right: .75rem;
+      margin-top: 1px;
     }
 
     .issue-item-icons-right > * + * {
@@ -29,10 +30,11 @@
       font-size: 16px;
       min-width: 0;
       font-weight: 600;
+    }
 
-      > * {
-        vertical-align: middle;
-      }
+    .labels-list {
+      position: relative;
+      top: -1.5px;
     }
 
     .issue-item-bottom-row {