fix(build): drop .editorconfig that breaks ktlint

[jamesarich]

The .editorconfig added in the community-health pass (#91, copied from meshtastic-sdk) broke the Lint job: ktlint reads .editorconfig, so sdk's rules now apply to mqtt's existing code and :transport-tcp:spotlessKotlinCheck (and others) fail on files nobody touched. Removing it restores a green Lint job — verified spotlessCheck passes without it. mqtt's code was already ktlint-clean under its own defaults. Adopting the org .editorconfig here would require a deliberate spotlessApply reformat (separate PR).

[coderabbitai]

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[Copilot]

Pull request overview

Note

Copilot couldn't run its full agentic review because it didn't start before the timeout. Make sure your repository has a runner available, or add a copilot-code-review.yml file specifying one with the runs-on attribute. See the docs for more details.

Removes the repo-level .editorconfig whose ktlint/spotless ruleset (copied from another project) was causing lint failures on untouched files, restoring the existing formatting/lint defaults for this codebase.

Changes:

• Delete the .editorconfig file to stop ktlint/spotless from applying incompatible formatting rules.
• Restore green linting by relying on the project’s prior ktlint/spotless defaults.