[22/n Dispatcher Refactor] resolving nits from previous review

This CL resolves following nits
1. Adds a reference to avoid copy from ag/31432553
2. Move a deceleration near to the use from ag/31432555

Bug: 245989146
Test: atest inputflinger_tests
Flag: EXEMPT refactor
Change-Id: I8dcf65251b8ac00fdcde3a97113825197272c326