Bug: Long pressing the amount input brings up QWERTY keyboard #689

Steps to reproduce the behaviour

1. Navigate to Transactions screen
2. Tap the Add button
3. Enter Description (optional)
4. Focus the Amount input
5. Long press to bring up the context menu

Expected behaviour

See the context menu

Actual behaviour

Software specifications

• GnuCash Android version: 2.2.0
• System Android version: 6.0
• Device type: Motorola Moto G (2nd Generation)