Set flex direction to row reverse to right-align imagery thumbnails (#4934)

* Set flex direction to row reverse so thumbnails are right-aligned

* Flex direction to justify content

Co-authored-by: John Hill <john.c.hill@nasa.gov>
Co-authored-by: Jamie V <jamie.j.vigliotta@nasa.gov>
Co-authored-by: Shefali Joshi <simplyrender@gmail.com>

src/plugins/imagery/components/imagery-view.scss

@@ -143,6 +143,7 @@
 
     &__thumbs-wrapper {
         display: flex; // Uses row layout
+        justify-content: flex-end;
 
         &.is-autoscroll-off {
             background: $colorInteriorBorder;