fix(platform-fastify): search method not declared

[johaven]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

The usage of the @Search method with fastify was not properly declared

node_modules/@nestjs/core/adapters/http-adapter.js:59
        return this.instance.search(...args);
                             ^

TypeError: this.instance.search is not a function
    at FastifyAdapter.search (node_modules/@nestjs/core/adapters/http-adapter.js:59:30)
    at node_modules/@nestjs/core/router/router-explorer.js:105:17
    at Array.forEach (<anonymous>)
    at node_modules/@nestjs/core/router/router-explorer.js:90:29
    at Array.forEach (<anonymous>)
    at RouterExplorer.applyCallbackToRouter (node_modules/@nestjs/core/router/router-explorer.js:82:15)
    at node_modules/@nestjs/core/router/router-explorer.js:65:18
    at Array.forEach (<anonymous>)
    at RouterExplorer.applyPathsToRouterProxy (node_modules/@nestjs/core/router/router-explorer.js:62:34)
    at RouterExplorer.explore (node_modules/@nestjs/core/router/router-explorer.js:49:14)

Does this PR introduce a breaking change?

• No

[coveralls]

Pull Request Test Coverage Report for Build cd5e366f-0c3a-4138-b054-2cb3cbc4a324

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.208%

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Totals
Change from base Build 7ea6f01d-9fcc-4d6c-90b4-f217d2306325:	0.0%
Covered Lines:	6745
Relevant Lines:	7315

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💛 - Coveralls

[kamilmysliwiec]

lgtm