fix: [FC-0063] Multiple input files processing is fixed

There was an error that after specifying several input files,
only the last one was processed. It's fixed and all input files
are processed now.

src/cc2olx/cli.py

@@ -11,16 +11,16 @@
 def parse_args(args=None):
     parser = argparse.ArgumentParser(
         description=(
-            "This script converts imscc files into folders with " "all the content; in the defined folder structure."
+            "This script converts imscc files into folders with all the content; in the defined folder structure."
         )
     )
     parser.add_argument(
         "-i",
         "--inputs",
-        nargs="*",
+        action="append",
         type=lambda p: Path(p).absolute(),
         required=True,
-        help=("Please provide the paths to the imscc files or directories " "that contain them."),
+        help="Please provide the paths to the imscc files or directories that contain them.",
     )
     parser.add_argument(
         "-l",