Clean not needed get_input function in DiMuonNoIPLine selection

Given that it created confusion in developing new lines (see this), just a small MR to remove the get_input function from this line, being not needed

added RTA label

assigned to @ahabdelm

@ahabdelm can you please start the ci here?

/ci-test

added ci-test-triggered label

• [2023-02-15 09:50] Validation started with lhcb-master-mr#7036

assigned to @rmatev

approved this merge request

resolved all threads

merged

mentioned in commit dd932aca

mentioned in issue Moore#527 (closed)