Disable background throttling

Reference: https://github.com/webtorrent/webtorrent-desktop/pull/1720#issuecomment-722011487

I actually think we want backgroundThrottling: false so our timers and intervals aren't throttled when the app is backgrounded.

src/main/windows/about.js

@@ -27,7 +27,8 @@ function init () {
     webPreferences: {
       nodeIntegration: true,
       enableBlinkFeatures: 'AudioVideoTracks',
-      enableRemoteModule: true
+      enableRemoteModule: true,
+      backgroundThrottling: false
     },
     width: 300
   })

src/main/windows/main.js

@@ -45,7 +45,8 @@ function init (state, options) {
     webPreferences: {
       nodeIntegration: true,
       enableBlinkFeatures: 'AudioVideoTracks',
-      enableRemoteModule: true
+      enableRemoteModule: true,
+      backgroundThrottling: false
     },
     x: initialBounds.x,
     y: initialBounds.y

src/main/windows/webtorrent.js

@@ -27,7 +27,8 @@ function init () {
     webPreferences: {
       nodeIntegration: true,
       enableBlinkFeatures: 'AudioVideoTracks',
-      enableRemoteModule: true
+      enableRemoteModule: true,
+      backgroundThrottling: false
     },
     width: 150
   })