grammar: Rename tmp_*_stmt to tmp_*_op

[kazarmy]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

This pr renames the tmp_*_stmt rules in rizin-shell-parser/grammar.js to tmp_*_op, because they no longer are statements and are just operators due to the removal of their initial _simple_stmt in #4826. The bash command used to do the mass renaming is:

REGEX="\(tmp_[a-z0-9]\+_\)stmt" bash -c 'git grep -l "$REGEX" | xargs -n 1 sed -i "s/$REGEX/\1op/"'

This is a continuation of #4826.

Test plan

All builds are green.

Closing issues

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