Fix for "Don't put an underline on linked images" (#125)

The changes in bb5dbf and 585c08 to clear the bottom border
are immediately getting overridden by the styles right below.
Swap the order so these styles are applied as intended.

Co-authored-by: jab <jab@users.noreply.github.com>

Author: jab

alabaster/static/alabaster.css_t

@@ -544,15 +544,15 @@ a.reference {
     border-bottom: 1px dotted {{ theme_link }};
 }
 
+a.reference:hover {
+    border-bottom: 1px solid {{ theme_link_hover }};
+}
+
 /* Don't put an underline on images */
 a.image-reference, a.image-reference:hover {
     border-bottom: none;
 }
 
-a.reference:hover {
-    border-bottom: 1px solid {{ theme_link_hover }};
-}
-
 a.footnote-reference {
     text-decoration: none;
     font-size: 0.7em;