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lua: fix flaky custom allocator test

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 unused memory with the one calculated
by the builtin Lua functions. This test has been failing on a few
workflows. 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.

NO_CHANGELOG=flaky tests
NO_DOC=flaky tests

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