Added TaggerTrackerTransportation.onnx to calibrations.xml (#823)

### Briefly, what does this PR introduce?
Adds the onnx implementation of the Low-Q2 reconstruction to the
calibrations.xml for download.

### What kind of change does this PR introduce?
- [ ] Bug fix (issue #__)
- [x] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __

### Please check if this PR fulfills the following:
- [ ] Tests for the changes have been added
- [ ] Documentation has been added / updated
- [ ] Changes have been communicated to collaborators

### Does this PR introduce breaking changes? What changes might users
need to make to their code?
no
### Does this PR change default behavior?
Downloads an additional onnx file.

Author: simonge

compact/calibrations.xml

@@ -9,6 +9,11 @@
       <arg value="file:calibrations/tmva/LowQ2_DNN_CPU.weights.xml"/>
       <arg value="url:https://raw.githubusercontent.com/eic/epic-data/e441e5d88d0a44a1e407d3083914ac1a7de26f41/tmva/LowQ2_DNN_CPU.weights.xml"/>
     </plugin>
+    <plugin name="epic_FileLoader">
+      <arg value="cache:$DETECTOR_PATH:/opt/detector"/>
+      <arg value="file:calibrations/onnx/TaggerTrackerTransportation.onnx"/>
+      <arg value="url:https://raw.githubusercontent.com/eic/epic-data/81a03e1ece63f9ecf956a605a674d89813d354a9/onnx/TaggerTrackerTransportation.onnx"/>
+    </plugin>
     <plugin name="epic_FileLoader">
       <arg value="cache:$DETECTOR_PATH:/opt/detector"/>
       <arg value="file:calibrations/onnx/identity_gemm_w1x1_b1.onnx"/>