tests: use less aggressive systemctl --wait timeout in TEST-03-JOBS (#4606)

If the "systemctl start" happens at an "unlucky" time such as 1000.9 seconds
and then e. g.  runs for 2.6 s (sleep 2 plus the overhead of starting the unit
and waiting for it) the END_SEC would be 1003.5s which would round to 1004,
making the difference 4. On busier testbeds the overhead apparently can take a
bit more than 0.5s. The main point is really that it doesn't wait that much
longer, so "-le 4" seems perfectly fine. We allow up to 1.5s in the subsequent
"wait5fail" test below too.

Fixes #4582

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