PowerMenu: Security Feature (Toggle) to Hide Reboot (reboot recovery) 2/2

Added missing "}"
Changed "If" to "if"
Added POWER_DIALOG_SHOW_REBOOT_HIDE in Settings.java
Removed tabs...

PS7-8: Hide -> Show to get in-line with other feats. Show by default.

Change-Id: I2ceb4bf42e3f0350cf6b4764a0b8e032b32836a3