fix default.qgc and two qgm

Author: jef-n

src/plugins/grass/modules/default.qgc

@@ -185,7 +185,7 @@
             </section>
             <section label="Map algebra">
                 <grass name="r.mapcalc"/>
-                <grass name="r.mapcalculator"version_max="6.4"/>
+                <grass name="r.mapcalculator" version_max="6.4"/>
             </section>
             <section label="Neighborhood analysis">
                 <grass name="r.neighbors"/>

src/plugins/grass/modules/r.cost.coord.qgm

@@ -3,7 +3,7 @@
 
 <qgisgrassmodule label="Generate raster of cumulative cost of moving between locations based on cost input raster and starting point(s) coordinates" module="r.cost">
     <option key="input"/>
-    <option key="coordinate"version_max="6.4"/>
+    <option key="coordinate" version_max="6.4"/>
     <option key="start_coordinates" version_min="7.0"/>
     <option key="output"/>
     <option key="max_cost" hidden="no"/>

src/plugins/grass/modules/r.walk.coord.qgm

@@ -4,7 +4,7 @@
 <qgisgrassmodule label="Generate raster of cumulative cost of moving between locations, based on elevation and friction input rasters and starting point(s) coordinates" module="r.walk">
     <option key="elevation"/>
     <option key="friction"/>
-    <option key="coordinate"version_max="6.4"/>
+    <option key="coordinate" version_max="6.4"/>
     <option key="start_coordinates" version_min="7.0"/>
     <option key="output"/>
     <flag key="k" hidden="no"/>