remove Dashboard bottom margin, since “powered by” has been moved now

src/scss/_dashboard.scss

@@ -72,7 +72,6 @@
   min-height: 400px;
   outline: none;
   border: 1px solid rgba($color-gray, 0.2);
-  margin-bottom: 30px;
 
   .uppy-Dashboard--modal & {
     z-index: $zIndex-3;