[Bug libstdc++/120465] std::erase_if for std::flat_map calls predicate with incorrect type

[eligorkadaf at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120465

--- Comment #7 from Eligor Kadaf <eligorkadaf at gmail dot com> ---
Thank you for the fast fix.