chore: remove duplicate setting of header params

[tiwarishubham635]

Fixes

Currently, contentType is being set in header at two places in case of form-url-encoded. One at this place, the other at this. Since we are passing it in headers, removing the explicit addition of contentType.

Checklist

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• [x] I have made a material change to the repo (functionality, testing, spelling, grammar)
• [x] I have read the Contribution Guidelines and my PR follows them
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• [x] I have added tests that prove my fix is effective or that my feature works
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• [x] I have added inline documentation to the code I modified

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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