tests: fix indent in rw.cpp

[szychows]

This change is 

[krzycz]

Reviewed 1 of 1 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[codecov[bot]]

Codecov Report

Merging #365 into master will increase coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #365      +/-   ##
==========================================
+ Coverage   76.95%   76.98%   +0.02%     
==========================================
  Files          67       67              
  Lines        8228     8228              
  Branches     1649     1649              
==========================================
+ Hits         6332     6334       +2     
+ Misses       1488     1487       -1     
+ Partials      408      407       -1

Flag	Coverage Δ
#ltp_tests	46.56% <ø> (+0.04%)	:arrow_up:
#sqlite_tests	45.35% <ø> (+0.03%)	:arrow_up:
#tests_antool	14.77% <ø> (ø)	:arrow_up:
#tests_posix_multi_threaded	25.67% <ø> (+0.06%)	:arrow_up:
#tests_posix_single_threaded	54.23% <ø> (ø)	:arrow_up:
#tests_preload	45.05% <ø> (+0.07%)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile/vfd_table.c	81.16% <0%> (+0.89%)	:arrow_up:

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