[rcore] Optimize gesture handling for PLATFORM_DRM

[ghost]

Changes

1. Optimizes the gesture handling for PLATFORM_DRM by reusing the touchAction var (R754, R769) instead of the now redundant gestureUpdate (L615, L634, L648, L664, L673, L709, L717, L733).

Code example

• This change can be tested with the core_input_gestures_web.c example or the core_input_gestures.c example.

Environment

• Tested on Raspberry Pi 3 Model B 1.2 (2015) with Linux (Raspberry Pi OS 12 Bookworm 32-bit armhf).

Edits

• 1: added line marks; editing.

[raysan5]

@ubkp Thanks! Nice optimization! I like optimizations that remove code and complexity! :D