[lldb] Make "help format" test more strict (#178216) Originally added in a81bd7f1014f316b42bf7274f76a340b833e663b / https://reviews.llvm.org/D35525, this test either was not strict enough, or lldb's behaviour has drifted since. I think the intention was to check exactly when the output of "help format" would wrap. Which should happen when we have printed up to the terminal width, minus a few characters because we walk backwards to the closest whitespace point to break at (so we don't split a word). I've updated the test to check the exact outputs and cover printing one line and two instances where we need to split different amounts onto a second line.
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