Just simply turn it off...
Manage your Touch ID settings
Go to Settings > Touch ID & Passcode to manage these settings:
Turn Touch ID on or off for Passcode, iTunes & App Store, or Apple Pay.
Enroll up to five fingerprints. Each new print might make fingerprint recognition take slightly longer.
Tap a fingerprint to rename it.
Swipe to delete a fingerprint.
Identify a fingerprint in the list by touching the Home button. The matching print in the list will be highlighted briefly.
Press the Home button using Touch ID to unlock your device. To unlock your device using Touch ID without pressing the Home button, go to Settings > General > Accessibility > Home Button and turn on Rest Finger to Open.
https://support.apple.com/en-us/HT203783