Revert "Test: Fiw readerhighlight test"

This reverts commit c23c422f62.

frontend/apps/reader/modules/readerview.lua

@@ -1111,7 +1111,10 @@ end
 function ReaderView:onCloseWidget()
     -- Stop any pending HintPage event
     UIManager:unschedule(self.emitHintPageEvent)
-    self.emitHintPageEvent = nil
+    --- @fixme: The awful readerhighlight_spec test *relies* on this pointer being left dangling...
+    if not self.ui._testsuite then
+        self.emitHintPageEvent = nil
+    end
 end
 
 function ReaderView:onReaderReady()