Fix unused file removal

CHDataManagement/Generator/Results/GenerationResults.swift

@@ -298,6 +298,10 @@ final class GenerationResults: ObservableObject {
     func requiredOutputFile(_ path: String) {
         update { self.requiredOutputFiles.insert(path) }
     }
+
+    func removeUnusedFile(_ unusedFile: String) {
+        update { self.unusedFilesInOutput.remove(unusedFile) }
+    }
 }
 
 private extension Dictionary where Value == Set<LocalizedItemId> {