removed multi select from link

* not neccessary and avoids confusion due to the fact that ctrl+click
creates a bendpoint on links

Issue-Ref: 3967
Issue-Url: https://af3-developer.fortiss.org/issues/3967



Signed-off-by: Johannes Eder <eder@fortiss.org>

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/lwfxef/controller/base/LinkControllerBase.java

@@ -131,11 +131,7 @@ public abstract class LinkControllerBase extends MVCBundlePartBase implements IC
 					DiagramCoordinate snappedLocation = features.snapToCenter(diagramLocation);
 					return () -> createBendPointAt(currentBendPointIndex, snappedLocation);
 				}
-				if(event.isShiftDown()) {
-					viewer.handleShiftSelectionOf(getMVCBundle());
-				} else {
-					viewer.setSingleSelectedMVCBundle(getMVCBundle());
-				}
+				viewer.setSingleSelectedMVCBundle(getMVCBundle());
 				return null;
 			}