settings: Remove taps to enable dev settings

Since development settings are shown by default, remove the unecessary
code and don't do anything when the build number is tapped

PS2: remove vairables also
PS2: moar variables/method

Change-Id: If9033113ecc49272d8875afb22dacc5b4aeefd98
Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>