Prevents fatal crash when wifi-connect tags are read multiple times.

Reading Wifi connect tags without dismissing the previous dialogue leads
to memory leaks in the Decor View and even a fatal crash for the nfc
process.

Test: Read wifi-connect tags continuously
Bug: 63804204
Change-Id: I2599f9a35723cdf67c80e1b186b7b0303d2c876c
1 file changed