Fix style

Author: blacelle

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/CleanthatJavaIntegrationTest.java

@@ -31,7 +31,7 @@ void integration() throws IOException {
 				"spotless {",
 				"    java {",
 				"        target file('test.java')",
-				"        cleanthat()" +
+				"        cleanthat()",
 				"          .sourceCompatibility('11')",
 				"          .addMutators(['LiteralsFirstInComparisons', 'OptionalNotEmpty'])",
 				"    }",