C#: Remove unnecessary import

Author: koesie10

csharp/ql/src/utils/modeleditor/ApplicationModeEndpointsQuery.qll

@@ -2,7 +2,6 @@ private import csharp
 private import semmle.code.csharp.dataflow.ExternalFlow
 private import semmle.code.csharp.dataflow.internal.DataFlowDispatch as DataFlowDispatch
 private import semmle.code.csharp.dataflow.internal.DataFlowPrivate
-private import semmle.code.csharp.dataflow.internal.DataFlowImplCommon as DataFlowImplCommon
 private import semmle.code.csharp.dataflow.internal.TaintTrackingPrivate
 private import semmle.code.csharp.security.dataflow.flowsources.Remote
 private import ModelEditor