Remove focusWindow function

Not needed -- win.show() automatically focuses, unminimizes, and shows
the window.

main/ipc.js

@@ -65,6 +65,7 @@ function init () {
   })
 
   ipcMain.on('openItem', function (e, path) {
+  ipc.on('show', (e, ...args) => windows.main.show(...args))
     log('open item: ' + path)
     electron.shell.openItem(path)
   })
@@ -87,10 +88,6 @@ function init () {
     shortcuts.onPlayerOpen()
   })
 
-  ipcMain.on('focusWindow', function (e, windowName) {
-    windows.focusWindow(windows[windowName])
-  })
-
   ipcMain.on('downloadFinished', function (e, filePath) {
     if (app.dock) {
       // Bounces the Downloads stack if the filePath is inside the Downloads folder.