Fix race condition in Svelte template #1805

Job	Run time
rustfmt	11s
cargo_test	4m 41s
clippy	3m 36s
nix_build	2m 41s
testbuild_by_scope (hello_world)	4m 6s
testbuild (svelte)	9m 6s
testbuild_by_scope (holo_integration)	3m 35s
testbuild (vue)	9m 15s
testbuild (lit)	9m 10s
testbuild (react)	10m 10s
testbuild (vanilla)	9m 27s
	1h 5m 58s

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