fix: add missing write_void_evol to lagrange_shbubcollapse example

Author: sbryngelson

examples/3D_lagrange_shbubcollapse/case.py

@@ -155,6 +155,7 @@
             "lag_params%valmaxvoid": 0.9,
             "lag_params%write_bubbles": "F",
             "lag_params%write_bubbles_stats": "F",
+            "lag_params%write_void_evol": "T",
             # Bubble parameters
             "bub_pp%R0ref": 1.0,
             "bub_pp%p0ref": 1.0,