Remove onlySuperchainTokenBridge modifier from SuperchainERC20

[gotzenx]

As discussed with @mds1 on SuperchainWETH Redesign PR to follow on an internal best practice, we will not use modifiers if they dont have code before and after ;.

Change
Remove onlySuperchainTokenBridge from SuperchainERC20 and add the check line to the functions directly.

[tynes]

Could we also update the tenses of the events so that they match the spec in this PR?

[gotzenx]

Could we also update the tenses of the events so that they match the spec in this PR?

Yes, we already had this change ready but we were waiting on the SuperchainWETH Redesign to be merged.
Events changes PR: #12564

@tynes