streamlines exception types

src/Umbraco.Core/Persistence/SqlSyntax/SqlServerSyntaxProvider.cs

@@ -263,7 +263,7 @@ where tbl.[name]=@0 and col.[name]=@1;", tableName, columnName)
                 db.Execute(@"SET LOCK_TIMEOUT 1800;");
                 var i = db.Execute(@"UPDATE umbracoLock WITH (REPEATABLEREAD) SET value = value*-1 WHERE id=@id", new { id = lockId });
                 if (i == 0) // ensure we are actually locking!
-                    throw new InvalidOperationException($"LockObject with id={lockId} does not exist.");
+                    throw new ArgumentException($"LockObject with id={lockId} does not exist.");
             }
         }