fix(builder): remove duplicate early-return in backfillNativeDroppedFiles #3909

Job	Run time
Verify dynamic imports	5s
Lint	6m 36s
Rust compile check	1m 2s
TypeScript type check	6m 32s
Native host build (macos-latest)	3m 43s
Security audit	6m 33s
Native host build (ubuntu-latest)	3m 37s
Native host build (windows-latest)	5m 58s
Pre-publish benchmark gate	10m 26s
Engine parity (macos-latest)	11m 16s
Engine parity (windows-latest)	13m 31s
Engine parity (ubuntu-latest)	6m 28s
Test Node 22 (macos-latest)	15m 42s
Test Node 22 (windows-latest)	15m 16s
Test Node 22 (ubuntu-latest)	10m 14s
CI Testing Pipeline	4s
	1h 57m 3s

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