Use strict equality checking

Remove usage of == and != in favour of === and !==.

test/integration/server.js

@@ -204,7 +204,7 @@ describe("Integration of lib/factorio/server", function() {
 		describe(".start() termination detection", function() {
 			it("should tell if Factorio got killed", async function() {
 				// This does not work on Windows
-				if (process.platform == "win32") {
+				if (process.platform === "win32") {
 					this.skip();
 				}
 				slowTest(this);