_sass: Inline module-label mixin

_sass/custom/mixins.scss

@@ -21,8 +21,3 @@
     margin: $sp-2 0;
   }
 }
-
-@mixin module-label() {
-  margin-left: 0;
-  padding-bottom: 0;
-}

_sass/custom/module.scss

@@ -87,19 +87,21 @@
       padding-top: 0;
     }
   }
-}
 
-.label.label-hw-out {
-  @extend .label-yellow;
-  @include module-label();
-}
+  .label {
+    margin-left: 0;
+    padding-bottom: 0;
 
-.label.label-hw-due {
-  @extend .label-red;
-  @include module-label();
-}
+    &.label-hw-out {
+      @extend .label-yellow;
+    }
 
-.label.label-section {
-  @extend .label-purple;
-  @include module-label();
+    &.label-hw-due {
+      @extend .label-red;
+    }
+
+    &.label-section {
+      @extend .label-purple;
+    }
+  }
 }