sys_core_fold: Remove uncovered clauses matching #c_map{}

sys_core_fold:eval_element/3 attempts to evaluate calls to element/2
at compile time or to warn when the call will obviously fail. For
example:

  element(1, [a])

will obviously fail and eval_element/3 will produce a warning.
eval_element/3 uses the helper functions is_not_integer/1 and
is_not_tuple/1 to test whether the arguments are known to be
incorrect. The clauses that attempt to match #c_map{} in those
helper function will never be executed, because #c_map{} will
never occur directly in an argument for a function call.

For example, code such as:

  element(1, #{a=>Val})

will be translated to:

  let <NewVar> = #{a=>Val}
    in element(1, NewVar)

since maps are not considered safe (some map operations may
cause an exception at run time).

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