fix program name in usage message

[mcalman]

When using Acelyzer as a library we're susceptible to misleading usage messages because ArgumentParser uses sys.argv[0] by default:

usage: tensorboard [-h] [-C [{power_ts4,power_ts3,coll_bw,bandwidth,prep_queue,rcu_util} ...]] [-c COMPILER_LOG] [-D {0,1,2,3,4}] [-F FILTER]
                   [-f FORMAT] [--freq FREQ] [--flow] [--freq_scaling FREQ_SCALING] -i INPUT [-I] [-k] [--drop_globals] [-M] [-O {drop,tid,async}]
                   [-o OUTPUT] [-R] [-S] [-s] [-t] [-T] [--autopilot_data AUTOPILOT_DATA] [--keep_prep] [--disable_tb] [--tb] [--disable_file]
                   [--flex_ts_fix] [--disable_input_warnings] [--comm_summarize_seq] [--time_unit {ms,ns}]
tensorboard: error: the following arguments are required: -i/--input

This PR fixes to to be:

usage: acelyzer [-h] [-C [{power_ts4,power_ts3,coll_bw,bandwidth,prep_queue,rcu_util} ...]] [-c COMPILER_LOG] [-D {0,1,2,3,4}]
                [-F FILTER] [-f FORMAT] [--freq FREQ] [--flow] [--freq_scaling FREQ_SCALING] -i INPUT [-I] [-k] [--drop_globals]
                [-M] [-O {drop,tid,async}] [-o OUTPUT] [-R] [-S] [-s] [-t] [-T] [--autopilot_data AUTOPILOT_DATA] [--keep_prep]
                [--disable_tb] [--tb] [--disable_file] [--flex_ts_fix] [--disable_input_warnings] [--comm_summarize_seq]
                [--time_unit {ms,ns}]
acelyzer: error: the following arguments are required: -i/--input

[lasch]

👍