Remove FlowFixMe's from TypeScript

Summary: This diff was a joy to draft.

Reviewed By: jknoxville

Differential Revision: D17344676

fbshipit-source-id: 0694d0393fa243edef61408ecfee92912fbbfa32

src/dispatcher/plugins.tsx

@@ -107,7 +107,6 @@ export function getDynamicPlugins() {
   let dynamicPlugins: Array<PluginDefinition> = [];
   try {
     dynamicPlugins = JSON.parse(
-      // $FlowFixMe process.env not defined in electron API spec
       (remote && remote.process.env.PLUGINS) || process.env.PLUGINS || '[]',
     );
   } catch (e) {