Fix a small error in r.lake.seed and r.lake.xy

Author: PedroVenancio

src/plugins/grass/modules/r.lake.seed.qgm

@@ -3,7 +3,7 @@
 
 <qgisgrassmodule label="Fill lake from seed at given level" module="r.lake">
 	<option key="dem" version_max="6.4"/>
-	<option key="elevation" version_max="7.0"/>
+	<option key="elevation" version_min="7.0"/>
 	<option key="seed" />
 	<option key="wl" version_max="6.4"/>
 	<option key="water_level" version_min="7.0"/>

src/plugins/grass/modules/r.lake.xy.qgm

@@ -3,7 +3,7 @@
 
 <qgisgrassmodule label="Fill lake from seed point at given level" module="r.lake">
 	<option key="dem" version_max="6.4"/>
-	<option key="elevation" version_max="7.0"/>
+	<option key="elevation" version_min="7.0"/>
 	<option key="xy" version_max="6.4"/>
 	<option key="coordinates" version_min="7.0"/>
 	<option key="wl" version_max="6.4"/>