Do not drop schema name from URI, even if it's the same as current

The dropping was done in 2007 to workaround a bug which was elsewhere
(in OGR usage, as reported in #843). I guess by now everything
would work transparently, but if it doesn't it'd be time to fix it
for real.

This commit fixes bug #6599, making life harder for NON-BOGUS code
which isn't confused by schemas...

Please test !

Author: Sandro Santilli

src/providers/postgres/qgspostgresprovider.cpp

@@ -1287,15 +1287,6 @@ bool QgsPostgresProvider::hasSufficientPermsAndCapabilities()
         mEnabledCapabilities |= QgsVectorDataProvider::AddFeatures;
       }
 
-      mCurrentSchema = testAccess.PQgetvalue( 0, 4 );
-      if ( mCurrentSchema == mSchemaName )
-      {
-        mUri.clearSchema();
-      }
-
-      if ( mSchemaName == "" )
-        mSchemaName = mCurrentSchema;
-
       sql = QString( "SELECT 1 FROM pg_class,pg_namespace WHERE "
                      "pg_class.relnamespace=pg_namespace.oid AND "
                      "pg_get_userbyid(relowner)=current_user AND "

src/providers/postgres/qgspostgresprovider.h

@@ -393,10 +393,6 @@ class QgsPostgresProvider : public QgsVectorDataProvider
      * Name of the schema
      */
     QString mSchemaName;
-    /**
-     * Name of the current schema
-     */
-    QString mCurrentSchema;
     /**
      * SQL statement used to limit the features retrieved
      */