Prevent `1x-playwright-install` reinstalling fresh `package.json` if `package-lock.json` found

[normanlolx]

Scenario: Qaack has its Playwright pinnned to 1.58 now. Onex comes with pinned Playwright 1.57 until now. Tests not executed anymore in Qaack because mismatch. So you go into a project and simply update local Playwright, push. Fine. New developer joins project and runs ddev 1x-playwright-install and suddenly gets Playwright 1.57 back because package-lock.json not respected and package.json overwritten again.

[frega]

PR #50 addresses this now.

@sreina-1x please review and merge.

After that i can release