Reset val_dataloader in tuner/batch_size_scaling for binsearch

[eladsegal]

What does this PR do?

#9857 fixed the issue for power, so this is the fix also for binsearch

Fixes #9832

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[codecov]

Codecov Report

Merging #9975 (6bb4bd6) into master (7b4df7b) will decrease coverage by 4%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #9975    +/-   ##
=======================================
- Coverage      93%     89%    -4%     
=======================================
  Files         179     179            
  Lines       15839   15840     +1     
=======================================
- Hits        14679   14059   -620     
- Misses       1160    1781   +621     

[rohitgr7]

Thanks! Totally missed that.

[tchaton]

LGTM !