fixed typo in tag name for fslbm dashboard

dashboards/dashboard_walberla.py

@@ -263,7 +263,7 @@ def dashboard_fslbmgravitywave():
         Filter("host"),
         Filter("project_id", multi=True, default_value='walberla/walberla'),
         Filter("branch", multi=True, default_value='master'),
-        Filter("numMPIProcess"),
+        Filter("numMPIProcesses"),
     ]
 
     fields = [PanelInfos("simulationTime", Units.seconds), ]