Avoid unprocessed file URIs being pasted to the terminal.

The `uris_as_paths` member, which is set to `true` when the paste
command has been triggered by the **Paste Filenames** action, was being
checked too late: a file URI was ultimately being entered to the
terminal, as opposed to the expected plain text version.

Test plan:

- Copy a file in Caja, or in any other file explorer that inserts the
  `text/uri-list` and `text/plain` MIME formats into the clipboard.
- Paste the file in a MATE Terminal either via `Ctrl+Shift+V`, or via
  the **Paste** action in the context menu.

Without this change, a file URI is entered. For example:

```
file:///home/jane.doe/my%20pictures/foo%20bar.jpg
```

With this change, a regular filepath [that the filesystem can recognize]
is pasted. For example:

```
/home/jane.doe/my pictures/foo bar.jpg
```

Note that the behavior of the **Paste Filenames** context menu action
remains unchanged (i.e. file URIs are still converted to regular paths
surrounded by single quotes).

0 files changed, 0 insertions, 0 deletions