Fix potential crash in help mode reverse search #336
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What does this PR do?
It's possible for help mode reverse search to index beyond the bounds of a page. On hardware, this is likely not a hard crash, but it could lead to unexpected behavior. On VCV Rack hitting this results in a crash (see Dewb/monome-rack#206).
How should this be manually tested?
See steps to reproduce in Dewb/monome-rack#206
I have,
CHANGELOG.mdandwhats_new.mdhelp_mode.c(if applicable)