Change default to true for diagonalLabel (#52)

Author: antoinebhs

src/main/java/org/gridsuite/studyconfig/server/entities/NetworkVisualizationParamEntity.java

@@ -47,7 +47,7 @@ public class NetworkVisualizationParamEntity {
     private String mapBaseMap = "mapbox";
 
     @Column(name = "diagonal_label")
-    private Boolean diagonalLabel = false;
+    private Boolean diagonalLabel = true;
 
     @Column(name = "center_label")
     private Boolean centerLabel = false;