Fix shadow compatibility.

Author: Fox2Code

dev/src/main/groovy/com/fox2code/foxloader/dev/compatibility/ShadowCompatibility.groovy

@@ -42,14 +42,16 @@ final class ShadowCompatibility extends CompatibilityModule {
         config.useJarTask(project.tasks.named('shadowJar', ShadowJar))
         project.tasks.jar.enabled = false
         project.tasks.assemble.dependsOn("shadowJar")
+        project.tasks.named('shadowJar', ShadowJar) {
+            archiveClassifier.set("")
+        }
     }
 
     @Override
     void onLateApply(Project project, FoxLoaderConfig config) {
         final HashSet<String> dependenciesToExclude = new HashSet<>()
         appendDependenciesNamesToExclude(config, dependenciesToExclude)
         project.tasks.named('shadowJar', ShadowJar) {
-            archiveClassifier.set("")
             dependencies {
                 exclude(new Spec<? super ResolvedDependency>() {
                     @Override