Refactor file handling to simplify and ensure accuracy

Change the handling of the file list to directly assign a flattened array to actual_files, removing unnecessary file selection and debugging logic. This modification aligns with the intention that 'files' should strictly be the expected collection of file paths, and simplifies the code by removing redundant checks and debug outputs that are assumed to be for debugging purposes only.

bin/ocran

@@ -502,12 +502,7 @@ EOF
           end
         end
 
-        files.flatten!
-        actual_files = files.select { |file| file.file? }
-
-        (files - actual_files).each do |missing_file|
-          Ocran.warn "#{missing_file} was not found"
-        end
+        actual_files = files.flatten
 
         Ocran.msg "\t#{actual_files.size} files, #{actual_files.sum(0, &:size)} bytes"