fix accidental save (and restore) of sigmask when interpreting try (#59878)
Noticed during bug hunting of
https://github.com/ericphanson/LicenseCheck.jl/issues/11#issuecomment-3417207015
and may cause performance degradation for interpreter-executed try
blocks or scope entry.
Co-authored-by: Dilum Aluthge <dilum@aluthge.com>