Use ensemble member for mask in snow recentering (#1242)

This PR uses the first ensemble member to mask the snow recentering
increment, and changes the logic so that anything below the min value
and above the max value is masked out.

utils/land/land_ensrecenter.h

@@ -133,9 +133,10 @@ namespace gdasapp {
           incrMaskConfig.get("variable", maskvarname);
           double minvalue = incrMaskConfig.getDouble("minvalue", -9e36);
           double maxvalue = incrMaskConfig.getDouble("maxvalue", 9e36);
+          const eckit::LocalConfiguration maskBkgConfig(incrMaskConfig, "background");
           oops::Variables maskVars(incrMaskConfig, "variable");
           fv3jedi::State maskbkg(geom, maskVars, cycleDate);
-          maskbkg.read(bkgConfig);
+          maskbkg.read(maskBkgConfig);
           atlas::FieldSet xbFs;
           maskbkg.toFieldSet(xbFs);
           /// Create the atlas fieldset for the output increment
@@ -144,7 +145,7 @@ namespace gdasapp {
           /// Loop over all points, if the mask is in range, zero out the increments
           auto bkgMask = atlas::array::make_view<double, 2>(xbFs[maskvarname]);
           for (atlas::idx_t jnode = 0; jnode < bkgMask.shape(0); ++jnode) {
-            if (bkgMask(jnode, 0) > minvalue && bkgMask(jnode, 0) < maxvalue) {
+            if (bkgMask(jnode, 0) < minvalue || bkgMask(jnode, 0) > maxvalue) {
               for (auto & var : varList.variables()) {
                 auto inc = atlas::array::make_view<double, 2>(ensincFs[var]);
                 for (atlas::idx_t level = 0; level < ensincFs[var].shape(1); ++level) {