perf trace: Add missing perf_tool__init()

perf trace: Add missing perf_tool__init()

Perf trace on perf.data fails as below:

	./perf trace record -- sleep 1
	./perf trace -i perf.data
	perf: Segmentation fault
	Segmentation fault (core dumped)

Backtrace pointed to :
	?? ()
	perf_session.process_user_event ()
	reader.read_event ()
	perf_session.process_events ()
	cmd_trace ()
	run_builtin ()
	handle_internal_command ()
	main ()

Further debug pointed that, segmentation fault happens when
trying to access id_index. Code snippet:

	case PERF_RECORD_ID_INDEX:
		err = tool->id_index(session, event);

Since 'commit 15d4a6f41d72 ("perf tool: Remove
perf_tool__fill_defaults()")', perf_tool__fill_defaults is
removed. All tools are initialized using perf_tool__init()
prior to use. But in builtin-trace, perf_tool__init is not
used and hence the defaults are not initialized. Use
perf_tool__init() in perf trace to handle the initialization.

Reported-by: Tejas Manhas <Tejas.Manhas1@ibm.com>
Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Link: https://lore.kernel.org/r/20250225113157.28836-1-atrajeev@linux.ibm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>