Fix incorrect arguments for google_compute_instance data source

[lawliet89]

Fixes #2535

I ran the test with:

GOOGLE_REGION="us-central1" GOOGLE_ZONE="us-central1-a" \
GOOGLE_PROJECT="xxx" GOOGLE_CREDENTIALS=xxx.json \
make testacc TEST=./google TESTARGS='-run=TestAccDataSourceComputeInstance_basic'

and the test passes:

==> Checking that code complies with gofmt requirements...
TF_ACC=1 TF_SCHEMA_PANIC_ON_ERROR=1 go test ./google -v -run=TestAccDataSourceComputeInstance_basic -timeout 120m -ldflags="-X=github.com/terraform-providers/terraform-provider-google/version.ProviderVersion=acc"
=== RUN   TestAccDataSourceComputeInstance_basic
=== PAUSE TestAccDataSourceComputeInstance_basic
=== CONT  TestAccDataSourceComputeInstance_basic
--- PASS: TestAccDataSourceComputeInstance_basic (157.80s)
PASS
ok  	github.com/terraform-providers/terraform-provider-google/google	157.813s

[rileykarson]

Thanks for fixing this! I lost track of the issue. This will be merged once GoogleCloudPlatform/magic-modules#1249 is approved.

[ghost]

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