Improper Initialization of trigger values when added at runtime with the key pressed already

See the comment on UInputTrigger::LastValue around issues being a bool type on first tick

1. Create two Input Actions, IA_A and IA_B
2. Create two mapping contexts, IMC_A and IMC_B
3. Add a mapping to the "Y" key in IMC_A to IA_A, with a pressed trigger
4. Add a mapping to the "Y" key in IMC_B to IA_B, with a pressed trigger
5. On begin play, add IMC_A to the player
6. When IA_A is triggered, add IMC_B and remove IMC_B
7. When IA_B is triggered, add a print string
8. PIE
9. Press and hold Y

Expected result: The IA_B print string does not print until you let go of "Y" and press it again.