Remove redundant code that handles mg_obj of PERL_MAGIC_symtab #23138
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The (badly-named) PERL_MAGIC_symtab no longer uses the `mg_obj` field. It is only applied in one place (at time of writing, toke.c line 10711) with the `obj` field set to NULL. Therefore, there is no point having code in `dump.c` to print it if non-NULL, nor in `sv.c` to special-case setting a non-NULL value in `sv_magicext()`.
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The (badly-named) PERL_MAGIC_symtab no longer uses the
mg_objfield. It is only applied in one place (at time of writing, toke.c line 10711) with theobjfield set to NULL. Therefore, there is no point having code indump.cto print it if non-NULL, nor insv.cto special-case setting a non-NULL value insv_magicext().