Fixes split button styling in modal footers

app/assets/stylesheets/framework/modal.scss

@@ -52,14 +52,16 @@
   display: flex;
   flex-direction: row;
-  .btn + .btn {
+  .btn + .btn:not(.dropdown-toggle-split),
+  .btn + .btn-group {
     margin-left: $grid-size;
   }
   @include media-breakpoint-down(xs) {
     flex-direction: column;
-    .btn + .btn {
+    .btn + .btn:not(.dropdown-toggle-split),
+    .btn + .btn-group {
       margin-left: 0;
       margin-top: $grid-size;
     }