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Fix binary number literal parsing.

Reported by Egor Skriptunoff.

(cherry-picked from commit 377a8488b)

Binary number with fractional part is invalid. Parsing of such binary
numbers returns `STRSCAN_ERROR` for any numbers with non-zero fractional
part, because it gives non-zero power of the exponent (`ex2`) in
`strscan_bin()`. But binary numbers with a zero fractional part
considered as valid numbers. To avoid such inconsistency the check, that
the given base doesn't equal 2, is added, when parsing decimal point
part of the literal.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#8825

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