fix scss lint errors

app/styles/components/kanban-task.scss

@@ -25,10 +25,6 @@
         @include table-flex();
         padding: 1rem 1rem 2rem;
     }
-    .task-num {
-        color: $postit-hover;
-        margin-right: .5em;
-    }
     .avatar {
         @include table-flex-child($flex-basis: 50px);
         a {

app/styles/components/taskboard-task.scss

@@ -5,6 +5,10 @@
     min-height: 7rem;
     position: relative;
     &:hover {
+        .icon-edit,
+        .icon-drag-h {
+            display: block;
+        }
         .icon {
             @include transition(coalor .3s linear, opacity .3s linear);
             color: $postit-dark-hover;
@@ -93,12 +97,6 @@
         cursor: move;
         right: 45%;
     }
-    &:hover {
-        .icon-edit,
-        .icon-drag-h {
-            display: block;
-        }
-    }
 }
 
 .task-drag {

app/styles/modules/backlog/sprints.scss

@@ -12,7 +12,7 @@
     .new-sprint {
         float: right;
         .button {
-            padding: .5rem 1.5rem .5rem;
+            padding: .5rem 1.5rem;
         }
     }
     .sprint-name {