Fixing default context setting when importing a context

Author: markcowl

src/ResourceManager/Common/Commands.Common.Authentication.ResourceManager/AzureRmProfile.cs

@@ -562,6 +562,7 @@ public bool TryCopyProfile(AzureRmProfile other)
                 TrySetContext(context.Key, context.Value);
             }
 
+            this.TrySetDefaultContext(other.DefaultContext);
             this.CopyPropertiesFrom(other);
             return true;
         }