Revert "Fixed some logic in PBXVariantGroup."

This reverts commit ea402c8.

Author: takeshi-1000

Sources/XcodeGenKit/PBXVariantGroupGenerator.swift

@@ -113,13 +113,10 @@ class PBXVariantGroupGenerator: TargetSourceFilterable {
             let pbxVariantGroupInfo = variantGroupInfoList
                 .filter { $0.targetName == targetName }
                 .first {
-                    let existsAlwaysStoredBaseFile: Bool = {
-                        var containExtensionList: [Bool] = []
-                        alwaysStoredBaseExtensions.forEach { alwaysStoredBaseExtension in
-                            containExtensionList.append(localizedChildPath.lastComponent.contains(alwaysStoredBaseExtension))
-                        }
-                        return containExtensionList.filter { $0 }.count > 0
-                    }()
+                    let existsAlwaysStoredBaseFile = alwaysStoredBaseExtensions
+                        .reduce(into: [Bool]()) { $0.append(localizedChildPath.lastComponent.contains($1)) }
+                        .filter { $0 }
+                        .count > 0
 
                     if existsAlwaysStoredBaseFile {
                         return $0.path.lastComponentWithoutExtension == localizedChildPath.lastComponentWithoutExtension