Avoid unnecessary Capabilities requests

[gacarrillor]

While parsing Opendata Swiss responses, we have a too broad condition (if "wms" in url.lower()) leading the plugin to go for resources like:

Title: WMS-Layer als Hintergrundkarten laden
Url: https://www.envidat.ch/dataset/seilaplan-tutorial-wms-layer-als-hintergrundkarten-laden/resource/18d13f78-0149-42bc-b962-fdd7bd972e4d
format: SERVICE

After this broad condition, I see there might be a code block with a wrong indentation, which makes the plugin always go for the resource (whose content in this case is malformed, thus the exception) as a WMS Capabilities resource, even if the resource didn't match another condition to be treated as a Capabilities one.

I guess it's a matter of fixing the indentation of this block to only perform the Capabilities request if it did match the aforementioned condition.

Fix #83

[3nids]

good catch