lib/ads: fix Telycam FALLBACK filename (BroadcastBeat, no space)
The fallback Telycam 300x250 src had "Broadcast Beat" with a space, but the actual file is "BroadcastBeat" (no space). When the centralized RMP cache was cold, FALLBACK kicked in and rendered a broken placeholder. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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