fix(device): convert PosixPath to str (#1)

The is_remote_path utility function returns `PosixPath` class, but the
functions later expect a string as parameter. This commit adds the
`as_posix()` call which converts the class into a `str` fixing this bug.

riocli/device/util.py

@@ -115,9 +115,9 @@ def is_remote_path(src, devices=[]):
         parts = src.split(":")
         if len(parts) == 2:
             if is_valid_uuid(parts[0]):
-                return parts[0], Path(parts[1]).absolute()
+                return parts[0], Path(parts[1]).absolute().as_posix()
             else:
                 for device in devices:
                     if device.name == parts[0]:
-                        return device.uuid, Path(parts[1]).absolute()
+                        return device.uuid, Path(parts[1]).absolute().as_posix()
     return None, src