Updated/fixed advection x test.

src/engine/tests/system/gt_data/advection_x/advection_x.mo

@@ -17,6 +17,7 @@ model advection_x
 	experiment(
 		MMO_Description="Advection",
 		MMO_Solver=LIQSS2,
+		MMO_SymDiff=false,
 		MMO_PartitionMethod=Scotch,
 		MMO_LPS=2,
 		MMO_DT_Min=2,

src/engine/tests/system/gt_data/advection_x/u[20000].dat

@@ -1,62 +1,66 @@
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