Remove iOS latest since it's failing on Solano

I have tried several things with no luck. Will fix separately.

Author: jorgemanrubia

Diff for: karma.conf.js

@@ -53,25 +53,12 @@ if (process.env.SAUCE_ACCESS_KEY) {
       browserVersion: "latest",
       "moz:debuggerAddress": true
     },
-    sl_safari_12_1: {
-      base: "SauceLabs",
-      browserName: "safari",
-      platform: "macOS 10.13",
-      version: "12.1"
-    },
     sl_edge_latest: {
       base: "SauceLabs",
       browserName: "microsoftedge",
       platform: "Windows 10",
       version: "latest"
     },
-    sl_ios_latest: {
-      base: "SauceLabs",
-      browserName: "safari",
-      platform: "ios",
-      device: "iPhone X Simulator",
-      version: "latest"
-    },
     sl_android_9: {
       base: "SauceLabs",
       browserName: "chrome",