cmd/go: add a source file in the multiple-paths module in TestScript/mod_tidy_replace
cmd/go: add a source file in the multiple-paths module in TestScript/mod_tidy_replace

This situation is analogous to CL 309334: the test expects 'go mod
tidy' to fail due to a module used for more than one path in the build
list, but doesn't actually contain any packages or imports — so no
module is necessarily used at all, and the error only occurs if we
report it prematurely.

For #36460

Change-Id: I5ccecf30f280895eba913a8d62571872b75e710d
Reviewed-on: https://go-review.googlesource.com/c/go/+/312098
Trust: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
Run-TryBot: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Michael Matloob <4562438b12c14e81a47550acde616ff328a909f8@golang.org>

CAFxX/go,golang/go,golang/go,golang/go,cloudflare/go,cloudflare/go,CAFxX/go,golang/go,CAFxX/go,CAFxX/go,CAFxX/go,nawawi/go,nawawi/go,cloudflare/go,cloudflare/go,cloudflare/go,CAFxX/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go,cloudflare/go,nawawi/go,nawawi/go,cloudflare/go,nawawi/go,golang/go,nawawi/go,nawawi/go,cloudflare/go,golang/go,golang/go