change color and move css

src/client/styles/scss/_comment.scss

@@ -44,7 +44,6 @@
     .page-comment-revision svg {
       width: 16px;
       height: 16px;
-      fill: $primary;
     }
   }
 

src/client/styles/scss/theme/_apply-colors.scss

@@ -418,6 +418,17 @@ body.on-edit {
   }
 }
 
+/*
+ * GROWI comment
+ */
+.page-comment-meta .page-comment-revision svg {
+  fill: $color-link;
+
+  &:hover() {
+    fill: $color-link-hover;
+  }
+}
+
 /*
  * GROWI comment form
  */