[travis] try to re-enable new test safeguard

.travis.script.bash

@@ -7,7 +7,7 @@ ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} make
 
 # this does nothing if all current tests are distributed already, but triggers full build if not
 # -> builder will timeout -> manually run refresh_test_timings -> push results
-# ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -v -j 1 refresh_test_timings
+${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -v -j 1 refresh_test_timings
 
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -v -j 1 test_binaries_builder_${TESTS}
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ctest -V -j 2 -L "^builder_${TESTS}$"