Fix a bug in River.tsc that affects portability

Funny story: so, there's a bugged TSC command in this file, which
causes it to try to read a flag beyond the end of the flag array.
If the memory it reads happens to be set to true, then it will
attempt to jump to an invalid event number, causing a crash.

Since I don't want to riddle CSE2's codebase with ugly compatibility
hacks, I think it's best to just fix the TSC file directly.

assets/data_en/Stage/River.tsc

@@ -1 +1 @@
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