Fix compilation of signer service

[ebma]

There is a small typo that makes us unable to run the signer service. This PR fixes it.

Error: Cannot find module './googleSpreadsheet.controller'
Require stack:
- /app/src/api/controllers/storage.controller.js
- /app/src/api/middlewares/validators.js
- /app/src/api/routes/v1/stellar.route.js
- /app/src/api/routes/v1/index.js
- /app/src/config/express.js
- /app/src/index.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:1144:15)
    at Module._load (node:internal/modules/cjs/loader:985:27)
    at Module.require (node:internal/modules/cjs/loader:1235:19)
    at require (node:internal/modules/helpers:176:18)
    at Object.<anonymous> (/app/src/api/controllers/storage.controller.js:2:42)
    at Module._compile (node:internal/modules/cjs/loader:1376:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1435:10)
    at Module.load (node:internal/modules/cjs/loader:1207:32)
    at Module._load (node:internal/modules/cjs/loader:1023:12)
    at Module.require (node:internal/modules/cjs/loader:1235:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/app/src/api/controllers/storage.controller.js',
    '/app/src/api/middlewares/validators.js',
    '/app/src/api/routes/v1/stellar.route.js',
    '/app/src/api/routes/v1/index.js',
    '/app/src/config/express.js',
    '/app/src/index.js'
  ]
}

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