Fix e2e to not check for X when running locally

[mcmire]

The X server check was only added to make Chrome tests run successfully
on CI.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[mcmire]

This is a dev fix, so if you can run some or all of Chrome e2e tests locally then this should be good to go.

[metamaskbot]

Builds ready [b42127c]

• builds: chrome, firefox, opera
• build viz: Build System
• code coverage: Report
• storybook: Storybook
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8
  • common: 0, 1, 2, 3
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • phishing-detect: phishing-detect
  • sentry-install: sentry-install
  • ui: 0, 1, 2, 3, 4, 5

Page Load Metrics (506 ± 54 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	371	726	503	110	53
		domContentLoaded	361	717	487	115	55
		load	380	728	506	112	54
		domInteractive	361	717	487	115	55

[brad-decker]

LGTM