data-aggregator: fix alphabetic resulttype sorting

Depending on SQL-statement nesting, some scripts already correctly sorted
resulttypes alphabetically, but some sorted along the numeric ENUM value
behind the resulttype name.  This change explicitly converts the resulttype
to a string before sorting.

Change-Id: Ia18aa4e75b94a6a9f7bb125953bc85b86b3cbd6e

tools/analysis/data-aggregator/fail-analysis-common.inc.sh

@@ -34,3 +34,4 @@ if [ -n "$BENCHMARK" ]; then
 		FILTER="$FILTER AND v.variant = '$VARIANT'"
 	fi
 fi
+FILTER="($FILTER)"