fix(ibm_is_vpn_gateway): reordered the setting of id in ibm_is_vpn_gateway resource to taint the resource properly

[ujjwal-ibm]

fix(ibm_is_vpn_gateway): reordered the setting of id in ibm_is_vpn_gateway resource to taint the resource properly

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Relates OR Closes #0000

Output from acceptance testing:

--- PASS: TestAccIBMISVPNGateway_taint (765.14s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     767.070s

--- PASS: TestAccIBMISVPNGateway_basic (587.40s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     588.735s