Update API tool_panels route conditions

[dannon]

explicitly specify operation so tool_panels are included in apispec & thus docs

Without any specified conditions, the APIspec doesn't know what actions the endpoint supports and lists no actions, even though it's a valid endpoint.

Do we ever deviate from the action being GET in the situation where it's a custom action name/function (i.e. -- not one of the default resource names 'index', 'create', 'show', etc)? If we do not, then we could update build_apispec to assume GET if not specified, but we'd really want to double check that.

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