Added missing return statement for web3-providers-http

[ghost]

Description

Added missing return statement for web3-providers-http, which is under the catch block.

( Might not be very important for someone using promise like me, but would fix the callback calling error twice )

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run dtslint with success and extended the tests and types if necessary.
• I ran npm run test:cov and my test cases cover all the lines and branches of the added code.
• I ran npm run build with success.
• I have tested the built dist/web3.min.js in a browser.
• I have tested my code on the live network.
• I have checked the Deploy Preview and it looks correct.
• I have updated the CHANGELOG.md file in the root folder.

[coveralls]

Pull Request Test Coverage Report for Build 2727583403

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.004%) to 74.603%

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Files with Coverage Reduction	New Missed Lines	%
packages/web3-providers-http/lib/index.js	1	77.36%

Totals
Change from base Build 2697072063:	0.004%
Covered Lines:	3270
Relevant Lines:	4132

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💛 - Coveralls