Fix parser fuzz crash by improving formatting of pattern alternatives #8133
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Latest parser crash from https://roc-lang.github.io/roc-compiler-fuzz:
zig build repro-parse -- -b YXBwW117ZjpwbGF0Zm9ybSIifVtdfHx7fW1hdGNoIDB7MHwjDTA9Pnt9CigpPT4wfQ== -v