fix: always use parameter UTF-8 fallback

Even when the filesystem encoding and sys.argv encoding are the same we
should still fall back to trying UTF-8 for decoding command line
arguments.

click/types.py

@@ -119,6 +119,8 @@ def convert(self, value, param, ctx):
                         value = value.decode(fs_enc)
                     except UnicodeError:
                         value = value.decode('utf-8', 'replace')
+                else:
+                    value = value.decode('utf-8', 'replace')
             return value
         return value