Fabian Homborg dd3cdbcfc9 Fix crash if $PWD is used as for-loop variable
for PWD in foo; true; end

prints:

>..src/parse_execution.cpp:461: end_execution_reason_t parse_execution_context_t::run_for_statement(const ast::for_header_t&, const ast::job_list_t&): Assertion `retval == ENV_OK' failed.

because this used the wrong way to see if something is read-only.
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