Update getConfiguration stubs to use .withArgs(settingId) instead of .callsFake

[shouples]

Makes reading through tests a bit easer.

.withArgs:

vscode/src/preferences/listener.test.ts

Lines 25 to 27 in cc08989

	const mockConfig = {
	get: sandbox.stub().withArgs(SSL_PEM_PATHS).returns(["path/to/pem"]),
	};

.callsFake:

vscode/src/commands/connections.test.ts

Lines 90 to 94 in cc08989

	const mockConfig = {
	get: sandbox.stub().callsFake((key: string) => {
	if (key === SSL_PEM_PATHS) return ["path/to/file.pem"];
	}),
	};