Fix bug when updating versions.

Author: bladecoder

adventure-editor/src/main/java/com/bladecoder/engineeditor/model/Project.java

@@ -445,7 +445,7 @@ public void updateEngineVersion(File projectPath) throws FileNotFoundException,
 		prop.setProperty("androidGradlePluginVersion", Versions.getAndroidGradlePluginVersion());
 		prop.setProperty("bladeInkVersion", Versions.getBladeInkVersion());
 
-		saveGradleProperties(prop);
+		saveGradleProperties(prop, projectPath);
 	}
 
 	/**
@@ -544,9 +544,9 @@ public Properties getGradleProperties(File projectPath) throws FileNotFoundExcep
 		return prop;
 	}
 
-	public void saveGradleProperties(Properties prop) throws IOException {
+	public void saveGradleProperties(Properties prop, File projectPath) throws IOException {
 		FileOutputStream os = new FileOutputStream(
-				getProjectDir().getAbsolutePath() + "/gradle.properties");
+				projectPath.getAbsolutePath() + "/gradle.properties");
 
 		prop.store(os, null);
 	}

adventure-editor/src/main/java/com/bladecoder/engineeditor/ui/PackageDialog.java

@@ -655,7 +655,7 @@ private void setCurrentVersion(String version) {
 		try {
 			Properties prop = Ctx.project.getGradleProperties(Ctx.project.getProjectDir());
 			prop.setProperty("version", version);
-			Ctx.project.saveGradleProperties(prop);
+			Ctx.project.saveGradleProperties(prop, Ctx.project.getProjectDir());
 		} catch (IOException e) {
 			Message.showMsg(getStage(), "Error reading file 'gradle.properties' from the game.", 3);
 		}