container: lib_finance: root: remove call via $ROOTSYS

- Ubuntu 'finance' image now has $ROOTSYS in $PATH
- Fixes breakage on Arch Linux 'finance' image

container/src/finance/lib/lib_finance.bash

@@ -207,11 +207,9 @@ function lib_finance::reports()
 
 function lib_finance::root()
 {
-  [ -z "$ROOTSYS" ] && lib_utils::die_fatal
-
   # NOTE: will automatically load rootlogon.C
   pushd "${DOCKER_FINANCE_CONTAINER_REPO}/src/root/macro" 1>/dev/null \
-    && "${ROOTSYS}"/bin/root -l
+    && root -l
   lib_utils::catch $?
 }