tests: ex_terminal_spec: retry ":terminal (with fake shell)" (#11588)

Flaky failure (Travis CI, macOS):

    [ RUN      ] :terminal (with fake shell) works with gf: 10518.41 ms FAIL
    test/functional/terminal/ex_terminal_spec.lua:248: Row 1 did not match.
    Expected:
      |*^ready $ echo "scripts/shadacat.py"                |
      |*                                                  |
      |*[Process exited 0]                                |
      |:terminal echo "scripts/shadacat.py"              |
    Actual:
      |*^                                                  |
      |*[Process exited 0]                                |
      |*                                                  |
      |:terminal echo "scripts/shadacat.py"              |
    To print the expect() call that would assert the current screen state, use
    screen:snapshot_util(). In case of non-deterministic failures, use
    screen:redraw_debug() to show all intermediate screen states.
    stack traceback:
            test/functional/ui/screen.lua:579: in function '_wait'
            test/functional/ui/screen.lua:361: in function 'expect'
            test/functional/terminal/ex_terminal_spec.lua:248: in function <test/functional/terminal/ex_terminal_spec.lua:245>

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