update flowconfig to ignore malformed_package_json in node modules (#…

…4023)

Summary:
flow check is failing on this repo right now

```
yarn run v1.22.19
$ flow check
Error --------------------------------------- node_modules/resolve/test/resolver/malformed_package_json/package.json:2:1
Unexpected end of input, expected the token `}`
   2|
Found 1 error
error Command failed with exit code 2.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Error: Process completed with exit code 2.
```

I wish facebook/flow#2364 was addressed that I didn't have to do this :(

Pull Request resolved: #4023

Test Plan:
Imported from GitHub, without a `Test Plan:` line.

**Static Docs Preview: relay**
|[Full Site](https://our.intern.facebook.com/intern/staticdocs/eph/D38072807/V2/relay/)|

|**Modified Pages**|

Reviewed By: alunyov

Differential Revision: D38072807

Pulled By: voideanvalue

fbshipit-source-id: 0190e69a7fd61fa1ce3bcd73c57435ba14466235

.flowconfig

@@ -2,6 +2,7 @@
 <PROJECT_ROOT>/dist/.*
 <PROJECT_ROOT>/compiler/.*
 <PROJECT_ROOT>/.*/node_modules/.*
+.*/node_modules/resolve/test/resolver/malformed_package_json/package.json
 
 [options]
 exact_by_default=true