Fixes the deprecation warnings for Foam::PtrList<T>::operator():
lnInclude/multiscalarMixtureI.H:198:25: warning: 'operator()' is deprecated: Since 2022-09; use "get(), set() or test() methods" [-Wdeprecated-declarations]
if(sourceEvents_(speciesi))
^
Fixes the deprecation warnings for
Foam::PtrList<T>::operator()
:by replacing those with
get()
calls.