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lua: fix flaky custom allocator test again

This patch fixes the flaky test verifying `used()` and `unused()`
functions of the `internal.alloc` module in the `alloc_test` suite.

The test compares the value of the used memory with the one calculated
by the builtin Lua functions. The executed and the real values has been
close to each other though not equal. This false negative result likely
happens because of the details of the `collectgarbage()` implementation.

This patch fixes it by adding arbitrary margin equal to 16Kb of memory
when comparing the value calculated using the LuaJIT call with the one
provided by the module function.

The same problem has been fixed in terms of the commit 7731d13d0af6a1
("lua: fix flaky custom allocator test"). The previous
commit fixed corresponding checks on the `unused()` value. This one
fixes `used()` checks that seem to be not precise in coverage workflows.

NO_CHANGELOG=flaky tests
NO_DOC=flaky tests

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