Change project response code to 200 when successful deletion

[freesky-edward]

What this PR does / why we need it:
Change the deletion response code of project resource
Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

[coveralls]

Pull Request Test Coverage Report for Build 361

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 68.256%

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Totals
Change from base Build 360:	0.004%
Covered Lines:	11721
Relevant Lines:	17172

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💛 - Coveralls