bIgnoreAllPressedKeysUntilReleaseOnRebuild ignores digital keys that are part of analog actions

UDN post raising this.

We ignore digital inputs only, but do so by querying Key.IsDigital(). This causes issues if the key is mapped to an analog action (i.e. it's emulating an axis). Proposed solution is to switch to querying Mapping.Action.ValueType == Boolean.

Fairly confident we'll be safe with changes to existing implementations. An analog action's behaviour should not change based on the input devices it has mapped to it, and users should be expecting that, so we shouldn't need to provide a fallback option.

1. Open the Shooter Gym in Lyra
2. PIE
3. Hold down W to walk forward
4. While holding down W, press 'k' to kill yourself
5. Keep holding down W

Expected: After you respawn and your animation finishes, your player continues walking