[eslint config] [patch] set namedComponents option to match style guide

Change the `namedComponents` option to `function-declaration` to match what the style guide requires.

019e0f7#r60060792

Author: petersendidit

packages/eslint-config-airbnb/rules/react.js

@@ -524,9 +524,8 @@ module.exports = {
 
     // Enforce a specific function type for function components
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/function-component-definition.md
-    // TODO: investigate if setting namedComponents to expression vs declaration is problematic
     'react/function-component-definition': ['error', {
-      namedComponents: 'function-expression',
+      namedComponents: ['function-declaration', 'function-expression'],
       unnamedComponents: 'function-expression',
     }],