Tool breaks with single file containing dash

https://github.com/ful1e5/clickgen/blob/ce70d07a0de82795dbedb9ebda594e79cacd4148/src/clickgen/scripts/clickgen.py#L88C17-L88C22

Using a file `first-second.png` will result into two files.

Something like this fixes it

```diff
- name = Path(files[0].name.split("-")[0])
+ name = Path(files[0].name)
+ if len(files) > 1:
+         name = Path(files[0].name.split("-")[0])
```