Restrict blocking of table popup to just Apple Books

This was causing an undesired inability to select text on Kobo. Of course, it turns out that we also can’t select text on Books either, but at least this fixes non-Books scenarios.

se/data/templates/compatibility.css

@@ -82,12 +82,12 @@ img.mathml{
 
 /* Apple Books will load a pannable zoomable table view when clicked, which is useful unless you’re
    trying to read a piece of drama. */
-[epub|type~="z3998:drama"] table,
-table[epub|type~="z3998:drama"]{
+:root[__ibooks_internal_theme] [epub|type~="z3998:drama"] table,
+:root[__ibooks_internal_theme] table[epub|type~="z3998:drama"]{
 	pointer-events: none;
 }
 
-[epub|type~="z3998:drama"] table a,
-table[epub|type~="z3998:drama"] a{
+:root[__ibooks_internal_theme] [epub|type~="z3998:drama"] table a,
+:root[__ibooks_internal_theme] table[epub|type~="z3998:drama"] a{
 	pointer-events: auto;
 }