refactor ZSTD_check_compressionLevel_monotonicIncrease_memoryBudget()

refactor ZSTD_check_compressionLevel_monotonicIncrease_memoryBudget()

use less macro statements
the initial version was meant to work with STATIC_ASSERT
but since it doesn't work and needs assert()
it's possible to rewrite it using normally compiled code
which is better for compiler.

Downside : the error message is less precise.
There is a DEBUGLOG(3,) to compensate.