Shellcheck fixes.

build.sh

@@ -245,7 +245,7 @@ command_test() {
         (>&2 echo "Following Safety DB IDs are to be excepted from checks:")
         (>&2 echo -e "\t${SAFETY_IGNORED_IDS}")
         # From $SAFETY_IGNORED_ID, generate $SAFETY_IGNORED_OPTS..
-        SAFETY_IGNORED_OPTS="$(echo $SAFETY_IGNORED_IDS | sed s/\ /\-i\ /g)"
+        SAFETY_IGNORED_OPTS="${SAFETY_IGNORED_IDS//\ /-i\ }"
     fi
 
     execute "$python_binary" -m safety check --full-report \