Headers are not being updated in GrapphQL client

[Nishchit Dhanani]

1. Describe the bug, what it is and what it should be (expected behavior)

In some cases, headers are not being saved in GraphQL requests.

2. To Reproduce

steps to reproduce the behavior:

1. go to GraphQL request or save a new one with 4-5 headers
2. Close the request tab
3. re-open the request
4. remove the last two headers and save the request. close the request tab
5. reopen the graphql request, review headers. all previously removed headers are there

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platform (please complete the following information):

• firecamp version: v2.6.2
• type: desktop
• os: mac