start-proxy: Remove unusued proxy_password input #3674

Job	Run time
Diagnostic export (ubuntu-latest, linked)	1m 1s
Diagnostic export (windows-latest, linked)	4m 10s
Diagnostic export (macos-latest, linked)	1m 26s
Diagnostic export (macos-latest, nightly-latest)	1m 38s
Diagnostic export (windows-latest, nightly-latest)	4m 52s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 1s
	14m 8s

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