Matrixmast reset prev aspect setting

[silverailscolo]

store/load Reset previous aspect for mast, schema

[bobjacobsen]

Thanks for this!

If you add the new content to java/test/jmri/implementation/configurexml/load/TenMastOutputs.xml, the load/store tests will make sure it doesn't get broken.

[codecov]

Codecov Report

Merging #7945 into master will increase coverage by 0.04%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #7945      +/-   ##
============================================
+ Coverage     47.43%   47.48%   +0.04%     
- Complexity    51318    51362      +44     
============================================
  Files          4162     4162              
  Lines        403281   403286       +5     
  Branches      60198    60201       +3     
============================================
+ Hits         191289   191484     +195     
+ Misses       192482   192275     -207     
- Partials      19510    19527      +17

Impacted Files	Coverage Δ	Complexity Δ
java/src/jmri/implementation/MatrixSignalMast.java	54.92% <ø> (ø)	39 <0> (ø)	⬇️
...plementation/configurexml/MatrixSignalMastXml.java	77.57% <0%> (-3.81%)	12 <0> (ø)
...54/xbee/swing/nodeconfig/AssignmentTableModel.java	20.4% <0%> (-14.29%)	5% <0%> (-5%)
java/src/jmri/server/json/JsonWebSocket.java	46.51% <0%> (-6.98%)	6% <0%> (-1%)
...src/jmri/jmrix/dccpp/dccppovertcp/ServerFrame.java	71.59% <0%> (-6.82%)	9% <0%> (-1%)
java/src/jmri/jmris/JmriConnection.java	58.97% <0%> (-2.57%)	7% <0%> (-1%)
...ava/src/jmri/jmrit/dispatcher/AutoTrainsFrame.java	50.77% <0%> (-1.04%)	20% <0%> (-1%)
...mri/jmrit/beantable/AddNewHardwareDevicePanel.java	84.31% <0%> (-0.99%)	8% <0%> (-1%)
java/src/jmri/jmrit/ctc/editor/gui/FrmIL.java	80.83% <0%> (-0.6%)	13% <0%> (ø)
java/src/jmri/jmrit/dispatcher/ActiveTrain.java	37.7% <0%> (-0.37%)	87% <0%> (-1%)
... and 33 more

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