Use .tmp before the file extension (#529)

When creating temporary files use the pattern `.tmp.ext` instead of
`.ext.tmp` to be consistent with Factorio which creates `.tmp.zip` files
during saving.

If patching fails this will leave a `.tmp.zip` file in the instance saves
directory which is ignored by the default save selector.

Resolves #486.

packages/controller/src/Controller.ts

@@ -449,7 +449,7 @@ export default class Controller {
 				continue;
 			}
 
-			if (entry.name.toLowerCase().endsWith("tmp.zip")) {
+			if (entry.name.toLowerCase().endsWith(".tmp.zip")) {
 				continue;
 			}