fix(rn,ConnectionQuality) use new APIs for target bitrate on RN

modules/connectivity/ConnectionQuality.js

 import CodecMimeType from '../../service/RTC/CodecMimeType';
 import * as RTCEvents from '../../service/RTC/RTCEvents';
 import * as ConnectionQualityEvents from '../../service/connectivity/ConnectionQualityEvents';
-import browser from '../browser';
 
 const Resolutions = require('../../service/RTC/Resolutions');
 const { VideoType } = require('../../service/RTC/VideoType');
     { width: 1920,
         height: 1080,
         layers: 3,
-        target: 'high',
-        targetRN: 4000000 },
+        target: 'high' },
     { width: 1280,
         height: 720,
         layers: 3,
-        target: 'high',
-        targetRN: 2500000 },
+        target: 'high' },
     { width: 960,
         height: 540,
         layers: 3,
-        target: 'standard',
-        targetRN: 900000 },
+        target: 'standard' },
     { width: 640,
         height: 360,
         layers: 2,
-        target: 'standard',
-        targetRN: 500000 },
+        target: 'standard' },
     { width: 480,
         height: 270,
         layers: 2,
-        target: 'low',
-        targetRN: 350000 },
+        target: 'low' },
     { width: 320,
         height: 180,
         layers: 1,
-        target: 'low',
-        targetRN: 150000 }
+        target: 'low' }
 ];
 
 /**
 
             simulcastFormat = kSimulcastFormats.find(f => f.height === targetHeight);
             if (simulcastFormat) {
-                target += browser.isReactNative()
-                    ? simulcastFormat.targetRN
-                    : videoQualitySettings[simulcastFormat.target];
+                target += videoQualitySettings[simulcastFormat.target];
             } else {
                 break;
             }
     } else if (simulcastFormat) {
         // For VP9 SVC, H.264 (simulcast automatically disabled) and p2p, target bitrate will be
         // same as that of the individual stream bitrate.
-        target = browser.isReactNative()
-            ? simulcastFormat.targetRN
-            : videoQualitySettings[simulcastFormat.target];
+        target = videoQualitySettings[simulcastFormat.target];
     }
 
     // Allow for an additional 1 second for ramp up -- delay any initial drop