Replace fix permissions with fix contexts for emulated storage

Fix permissions rarely fixed anything on more recent versions of
Android and usually made things worse. Instead we will replace it
with a more dumbed down option that should fix contexts on
/data/media with a few improvements to ensure that contexts get
fixed for multiple users and on adopted storage.

Change-Id: If5523781936a0b04196e2ad871cae767ebae2583
diff --git a/gui/objects.hpp b/gui/objects.hpp
index e7ade18..d64a5fc 100644
--- a/gui/objects.hpp
+++ b/gui/objects.hpp
@@ -337,6 +337,7 @@
 	int wipe(std::string arg);
 	int refreshsizes(std::string arg);
 	int nandroid(std::string arg);
+	int fixcontexts(std::string arg);
 	int fixpermissions(std::string arg);
 	int dd(std::string arg);
 	int partitionsd(std::string arg);