fix(builder): remove duplicate early-return in backfillNativeDroppedFiles #3882

Job	Run time
Verify dynamic imports	7s
Lint	6m 30s
Rust compile check	54s
Native host build (windows-latest)	5m 50s
Security audit	6m 32s
Native host build (ubuntu-latest)	3m 38s
Native host build (macos-latest)	2m 34s
TypeScript type check	6m 50s
Pre-publish benchmark gate	10m 16s
Test Node 22 (macos-latest)	8m 58s
Test Node 22 (ubuntu-latest)	8m 3s
Test Node 22 (windows-latest)	15m 51s
Engine parity (macos-latest)	9m 36s
Engine parity (ubuntu-latest)	6m 29s
Engine parity (windows-latest)	13m 3s
CI Testing Pipeline	4s
	1h 45m 15s

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