[libgdamm] DataHandler: Use newer Gda* interface name

[Murray Cumming <murrayc src gnome org>]

commit d17e6cfeb948abad19a4e920aba08b888838ced1
Author: Murray Cumming <murraycu google com>
Date:   Sun Jan 12 11:42:47 2020 +0100

    DataHandler: Use newer Gda* interface name
    
    It is now GdaDataHandlerInterface, not GdaDataHandlerIface.

 libgda/src/datahandler.hg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgda/src/datahandler.hg b/libgda/src/datahandler.hg
index 6ed7073..ea226ee 100644
--- a/libgda/src/datahandler.hg
+++ b/libgda/src/datahandler.hg
@@ -55,7 +55,7 @@ namespace Gda
  */
 class DataHandler : public Glib::Interface
 {
-  _CLASS_INTERFACE(DataHandler, GdaDataHandler, GDA_DATA_HANDLER, GdaDataHandlerIface)
+  _CLASS_INTERFACE(DataHandler, GdaDataHandler, GDA_DATA_HANDLER, GdaDataHandlerInterface)
 public:
 
   _WRAP_METHOD(Glib::ustring get_sql_from_value(const Value& value) const, 
gda_data_handler_get_sql_from_value)