dataengines/weather: Fix finding ions on Plasma5Support
Plasma5Support expects that dataengine plugins will be in the form of "plasma_engine_x", so let's rename the ions' library names to match this expectation
Also "Id" keyword on plugin json descriptions is deprecated, but we still want to provide the short ion name (ex. "noaa") instead of the full qualified library name
BUG: 470936 FIXED-IN: 6