Remove command line flag which caused blurriness and missing pixels o…

…n Windows

This was originally added to fix #4517, #4518, and #4472... but is no longer needed (I confirmed all those situations work).

Fixes #6462
Fixes #6777
Fixes #6144
Fixes #3556
Fixes #2089

Auditors: @bridiver, @bbondy, @darkdh

app/index.js

@@ -78,8 +78,6 @@ const privacy = require('../js/state/privacy')
 const async = require('async')
 const settings = require('../js/constants/settings')
 
-// temporary fix for #4517, #4518 and #4472
-app.commandLine.appendSwitch('enable-use-zoom-for-dsf', 'false')
 app.commandLine.appendSwitch('enable-features', 'BlockSmallPluginContent,PreferHtmlOverPlugins')
 
 // Used to collect the per window state when shutting down the application