Update ProjectUpdateWorker.kt

Author: Frotty

src/main/kotlin/workers/ProjectUpdateWorker.kt

@@ -5,7 +5,7 @@ import java.nio.file.Path
 import javax.swing.SwingWorker
 
 /** Handles updating an existing project */
-class ProjectUpdateWorker(private val projectRoot: Path, private val gamePath: Path, private val configData: WurstProjectConfigData) : SwingWorker<Boolean, Void>() {
+class ProjectUpdateWorker(private val projectRoot: Path, private val gamePath: Path?, private val configData: WurstProjectConfigData) : SwingWorker<Boolean, Void>() {
 
     @Throws(Exception::class)
     override fun doInBackground(): Boolean? {