Replace instance dropdown to slider for dicom tag browser

platform/ui/src/components/ohifModal/OHIFModal.styl

@@ -32,6 +32,10 @@
     max-height: 90vh;
     overflow-y: auto;
 
+  &.noScroll &__content {
+    overflow: hidden;
+  }
+
   &:not(.visibleScrollbar) &__content
     overflow-x: hidden;
     scrollbar-width: none;