Rename TESTS_USAN to TESTS_ASAN

[igchor]

to match CMake option

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This change is 

[KFilipek]

Looks like typo after copy-pasted, but respect for being consistent.

Reviewed 3 of 3 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @igchor)

[codecov]

Codecov Report

Merging #1161 (864bff0) into master (433d174) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1161      +/-   ##
==========================================
+ Coverage   94.08%   94.10%   +0.01%     
==========================================
  Files          52       52              
  Lines        5154     5154              
==========================================
+ Hits         4849     4850       +1     
+ Misses        305      304       -1     

Flag	Coverage Δ
tests_clang_debug_cpp17	93.60% <ø> (ø)
tests_gcc_debug	90.84% <ø> (+0.26%)	⬆️

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Impacted Files	Coverage Δ
...ude/libpmemobj++/container/concurrent_hash_map.hpp	94.35% <0.00%> (ø)
include/libpmemobj++/transaction.hpp	82.35% <0.00%> (+0.84%)	⬆️

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