make v.what.vect working with GRASS 6.4.2rc2 (fix #4552)

Author: brushtyler

src/plugins/grass/modules/v.what.vect.qgm

@@ -5,5 +5,5 @@
 	<option key="vector" layeroption="layer" typemask="point"/>
 	<field key="column" layer="vector" type="integer,double,string"/>
 	<option key="qvector" layeroption="qlayer" typemask="area"/>
-	<field key="qcolumn" layer="qvector" type="string"/>
+	<field key="qcolumn" layer="qvector" type="integer,double,string"/>
 </qgisgrassmodule>