[Scatter Plot app] improvements / bugs

[Andreas Rabe]

Reported by @Fabian Thiel .

1. Plot is static, is that intended? Its not bad, but I’m just used to the interactiveness of pyqtgraph 😊
2. Previous app allowed 2d binning with specifiable bin size, right? Is that not desired anymore? Again, not criticizing, just observing
3. Random, I don’t know how i triggered this:

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AttributeError: 'NoneType' object has no attribute 'mapSettings' 
Traceback (most recent call last):
  File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/coreapps/scatterplotapp/scatterplotdialog.py", line 249, in onLiveUpdate
    self.onApplyClicked()
  File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/coreapps/scatterplotapp/scatterplotdialog.py", line 195, in onApplyClicked
    extent = self.currentExtent()
  File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/site-packages/typeguard/__init__.py", line 903, in wrapper
    retval = func(*args, **kwargs)
  File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/coreapps/scatterplotapp/scatterplotdialog.py", line 124, in currentExtent
    mapSettings: QgsMapSettings = self.mMapCanvas.mapSettings()
AttributeError: 'NoneType' object has no attribute 'mapSettings'

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[Andreas Rabe]

1. yes, makes things easier in the background
2. correct, not desired anymore. Screen-res is now defining the binning.
3. can’t reproduce

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