fix EditingRedPacket UI issue in keyboard

[jk234ert]

Modification:

1. Adjust inset of EditingRedPacketViewController's tableview in keyboard
2. Add separate view for user to choose a wallet in the keyboard, since previous implementation using UIPickerView is invalid in keyboard extension

[MainasuK]

The Red Packet entry may be hide after the user selects a contract. (Design detail missing or not applicable) @neruthes

• After tapping the "Example" contract cell. The user could tap the "Red Packet" key icon to display the send red packet view panel. But maybe that not expected behavior.
• Previous we only have the encryption option here. And the "Red Packet" icon reuses the "signing" icon which deprecated before. Needs a new icon or refresh entry design. The keyboard should be reflected in Figma.

[neruthes]

Figma link: https://www.figma.com/file/BlCiZUHohnjLqXpdbDmFgi/Keyboard-v2?node-id=0%3A1

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