fix detection of android emulator

at some point, the `Build.FINGERPRINT` of the emulator has changed and
no longer includes `generic` as an option.

It apparently now, on all platforms, includes `google/sdk_gphone` at the
beginning.

ReactAndroid/src/main/java/com/facebook/react/modules/systeminfo/AndroidInfoHelpers.java

@@ -32,7 +32,7 @@ private static boolean isRunningOnGenymotion() {
   }
 
   private static boolean isRunningOnStockEmulator() {
-    return Build.FINGERPRINT.contains("generic");
+    return Build.FINGERPRINT.contains("generic") || Build.FINGERPRINT.startsWith("google/sdk_gphone");
   }
 
   public static String getServerHost(Integer port) {