[mssqlspatial] Fix creation of metadata tables

The query was testing whether [dbo].[geometry_columns] exists,
but then attempting to create just [geometry_columns] (without
"dbo").

This fails if the table will be created in any schema other then
"dbo".

Adjust to check whether just [geometry_columns] exists, so that
we are checking whether the table exists in the ACTUAL schema
we'll be creating it in.

Author: nyalldawson

ogr/ogrsf_frmts/mssqlspatial/ogrmssqlspatialdatasource.cpp

@@ -1360,9 +1360,7 @@ OGRErr OGRMSSQLSpatialDataSource::InitializeMetadataTables()
         CPLODBCStatement oStmt(&oSession);
 
         oStmt.Append(
-            "IF NOT EXISTS (SELECT * FROM sys.objects WHERE "
-            "object_id = OBJECT_ID(N'[dbo].[geometry_columns]') AND type in "
-            "(N'U')) "
+            "IF OBJECT_ID(N'[geometry_columns]', N'U') IS NULL "
             "CREATE TABLE geometry_columns (f_table_catalog varchar(128) not "
             "null, "
             "f_table_schema varchar(128) not null, f_table_name varchar(256) "
@@ -1373,9 +1371,7 @@ OGRErr OGRMSSQLSpatialDataSource::InitializeMetadataTables()
             "CONSTRAINT geometry_columns_pk PRIMARY KEY (f_table_catalog, "
             "f_table_schema, f_table_name, f_geometry_column));\n");
 
-        oStmt.Append("IF NOT EXISTS (SELECT * FROM sys.objects "
-                     "WHERE object_id = OBJECT_ID(N'[dbo].[spatial_ref_sys]') "
-                     "AND type in (N'U')) "
+        oStmt.Append("IF OBJECT_ID(N'[spatial_ref_sys]', N'U') IS NULL "
                      "CREATE TABLE spatial_ref_sys (srid integer not null "
                      "PRIMARY KEY, auth_name varchar(256), auth_srid integer, "
                      "srtext varchar(2048), proj4text varchar(2048))");