fix: Corrected the verification of Mono and Wine installation status

[BitYoungjae]

The old code wrongly checked if Mono and Wine were installed. It looked like this:

windows-installer/src/index.ts

Lines 26 to 40 in 073930d

	export async function createWindowsInstaller(options: SquirrelWindowsOptions): Promise<void> {
	let useMono = false;
	const monoExe = 'mono';
	const wineExe = process.arch === 'x64' ? 'wine64' : 'wine';
	if (process.platform !== 'win32') {
	useMono = true;
	if (!wineExe || !monoExe) {
	throw new Error('You must install both Mono and Wine on non-Windows');
	}
	log(`Using Mono: '${monoExe}'`);
	log(`Using Wine: '${wineExe}'`);
	}

The part (!wineExe || !monoExe) didn't work right because wineExe and monoExe were just text, not real checks.

Now, the code really checks if Wine and Mono are there. This fix makes sure the setup works right and checks everything needed.

[BlackHole1]

LGTM. PTAL @electron/wg-ecosystem

[continuous-auth]

🎉 This PR is included in version 5.1.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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