fix(ssh): update http encoding for ssh key creation request

[tamazlykar]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 1807

• 17 of 25 (68.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 53.439%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/app/shared/services/base-backend.service.ts	9	11	81.82%
src/app/shared/services/ssh-keypair.service.ts	1	3	33.33%
src/app/utils/encoders/custom-encoder.ts	7	11	63.64%

Totals
Change from base Build 1805:	-0.01%
Covered Lines:	9527
Relevant Lines:	15823

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💛 - Coveralls