Fix TargetHttpProxy tests

[emilymye]

strip_query were made required in GoogleCloudPlatform/magic-modules#3443 but tests don't have the field

Failing Tests:

TestAccComputeRegionTargetHttpProxy_regionTargetHttpProxyHttpsRedirectExample
TestAccComputeRegionUrlMap_defaultUrlRedirect
TestAccComputeTargetHttpProxy_targetHttpProxyHttpsRedirectExample
TestAccComputeUrlMap_defaultUrlRedirect

[ghost]

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