Improve GUI handling of zip flashing

- change the page sooner so that users cannot activate the slider
  twice
- improve GUI messaging if a zip requests a cache wipe
- move update of the file count to the end so it is less visible
  to the user (e.g. during a cache wipe the counter should not
  read 0)

Change-Id: I5d478f07effe61ca37f3521a77c9e9243a9cb692
diff --git a/gui/objects.hpp b/gui/objects.hpp
index bb3edb3..a89f486 100644
--- a/gui/objects.hpp
+++ b/gui/objects.hpp
@@ -285,7 +285,7 @@
 	int doAction(Action action);
 	bool needsToRunInSeparateThread(const Action& action);
 	void simulate_progress_bar(void);
-	int flash_zip(std::string filename, std::string pageName, int* wipe_cache);
+	int flash_zip(std::string filename, int* wipe_cache);
 	void reinject_after_flash();
 	void operation_start(const string operation_name);
 	void operation_end(const int operation_status);