KeyboardInputMapper_test: send UP in Process_SendsReadTime

This was sending two key downs, rather than a down and an up.

Test: atest --host \
      frameworks/native/services/inputflinger/tests/KeyboardInputMapper_test.cpp
Bug: 245989146
Flag: TEST_ONLY
Change-Id: Iea57303277766dcfbe8be7e2cd32d0e88e5059d3
1 file changed