fix key-errors for in data_apapter.resolve_paths

[DirkEilander]

We can escape unknown keys by doubling the { }
see also https://stackoverflow.com/questions/20673316/keyerror-when-using-format-on-a-string-in-python

ref error:

File "C:\SnapVolumesTemp\MountPoints\{45c63495-0000-0000-0000-100000000000}\{172729CE-4BD1-48B3-8852-95B69B4E24A4}\SVROOT\repo\hydromt_wflow\hydromt_wflow\wflow.py", line 768, in setup_gauges
gdf = self.data_catalog.get_geodataframe(
File "c:\Users\velden\Miniconda3\envs\hydromt-wflow\lib\site-packages\hydromt\data_adapter.py", line 517, in get_geodataframe
gdf = source.get_data(
File "c:\Users\velden\Miniconda3\envs\hydromt-wflow\lib\site-packages\hydromt\data_adapter.py", line 1524, in get_data
_ = self.resolve_paths() # throw nice error if data not found
File "c:\Users\velden\Miniconda3\envs\hydromt-wflow\lib\site-packages\hydromt\data_adapter.py", line 784, in resolve_paths
path = str(self.path).format(year=yr, month=mth, variable=var)
KeyError: '45c63495-0000-0000-0000-100000000000'