Reset sequence fix

[darkdef]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[what-the-diff]

• The method resetSequence() in DMLQueryBuilder.php was changed to return a string instead of an array
• In CommandTest, the testExecuteResetSequence() function was added which tests that after deleting and then reseeding the sequence for table item, it will start at 1 again (instead of 2)
• In QueryBuilderTest, we change what is expected from $qb->resetSequence('item') so that it returns "DBCC CHECKIDENT ('[item]', RESEED)" instead of "DBCC CHECKIDENT ('[item]', RESEED, 0) WITH NO_INFOMSGS;DBCC CHECKIDENT ('[item]', RESEED)"

[codecov]

Codecov Report

Base: 94.51% // Head: 94.49% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (9655e57) compared to base (6845480).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #129      +/-   ##
============================================
- Coverage     94.51%   94.49%   -0.03%     
  Complexity      209      209              
============================================
  Files            16       16              
  Lines           529      527       -2     
============================================
- Hits            500      498       -2     
  Misses           29       29              

Impacted Files	Coverage Δ
src/DMLQueryBuilder.php	100.00% <100.00%> (ø)

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