Polish test fixture publication skipping config

Thanks to @jjohannes for the tip.

See gh-23550

gradle/spring-module.gradle

@@ -55,6 +55,13 @@ task javadocJar(type: Jar) {
 publishing {
 	publications {
 		mavenJava(MavenPublication) {
+			from components.java
+			artifact sourcesJar
+			artifact javadocJar
+		}
+	}
+}
+
 // Disable publication of test fixture artifacts.
 //
 // Once we upgrade to Gradle 6.x, we will need to delete the following line ...
@@ -62,10 +69,3 @@ publishing {
 // ... and uncomment the following two lines.
 // components.java.withVariantsFromConfiguration(configurations.testFixturesApiElements) { skip() }
 // components.java.withVariantsFromConfiguration(configurations.testFixturesRuntimeElements) { skip() }
-
-			from components.java
-			artifact sourcesJar
-			artifact javadocJar
-		}
-	}
-}