Stop capturing mtp_event by reference in lambda

This takes a reference to the event,
which then can become invalid. Instead
pass by copy like normal.

Bug: 64529223
Test: No crash
Change-Id: I2ac7bd0002e6d0ce1c547c24334dfd2926ed7090
(cherry picked from commit 7360303d3e93cd6a5fd8c5c4340a335416bd0f28)
1 file changed