Fix #4668 (GRASS r.sunmask modules)

Author: pcav

src/plugins/grass/modules/r.sunmask.date.time.qgm

@@ -2,7 +2,7 @@
 <!DOCTYPE qgisgrassmodule SYSTEM "http://mrcc.com/qgisgrassmodule.dtd">
 
 <qgisgrassmodule label="Calculate shadow maps from sun position determinated by date/time" module="r.sunmask">
-	<option key="elev" />
+	<option key="elevation" />
 	<option key="year" />
 	<option key="month" />
 	<option key="day" />

src/plugins/grass/modules/r.sunmask.position.qgm

@@ -2,9 +2,9 @@
 <!DOCTYPE qgisgrassmodule SYSTEM "http://mrcc.com/qgisgrassmodule.dtd">
 
 <qgisgrassmodule label="Calculate shadow maps from exact sun position" module="r.sunmask">
-	<option key="elev" />
+	<option key="elevation" />
 	<option key="altitude" />
 	<option key="azimuth" />
 	<flag key="z" answer="off"/>
 	<option key="output" />
-</qgisgrassmodule>
+</qgisgrassmodule>