revert: feat(autoware_launch): set use_sim_time parameter equal to true when (#746)

[xmfcx]

Description

This reverts commit 2b51045.
cc. @pawellech1

Related PR:

• feat(autoware_launch): set use_sim_time parameter equal to true when … #746

Reason from @maxime-clem :

This change prevents from using use_sim_time:=true outside of using the scenario_simulation.
Previously I would add the argument to my launch command ros2 launch ... use_sim_time:=true but this is no longer possible and I had to revert the changes of this PR.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[xmfcx]

@takayuki5168 -san, thanks for the quick review!