[BUG] VPN mode fails to bootstrap because it can not bind to port 53

**Describe the Bug**
There has been a longstanding bug in OrbotVpnManager that causes Orbot to get stuck at about 10% while bootstrapping to the Tor network. My tablet running Nougat is one of those affected devices. I spent some time trying to debug this issue and if I change `tproxy_conf` to bind to port 5353 (instead of port 53), Orbot's VPN mode starts right up with no issues. Although, I know this will not work because hev-socks5 needs to listen on port 53 in order to see the requests. I have tried changing the order in the builder below with little success.

```
---- a/app/src/main/java/org/torproject/android/service/vpn/OrbotVpnManager.java
+++ b/app/src/main/java/org/torproject/android/service/vpn/OrbotVpnManager.java
@@ -128,6 +128,7 @@ public class OrbotVpnManager implements Handler.Callback {
try {
builder.addAddress(TProxyService.VIRTUAL_GATEWAY_IPV4, 32)
.setMtu(TProxyService.TUNNEL_MTU)
+ .addRoute("198.18.0.0", 16)
.addRoute("0.0.0.0", 0)
.addDnsServer(TProxyService.FAKE_DNS)
.setSession(Notifications.getVpnSessionName(mService))

```

Is there a way for hev-socks5 to use a different port for DNS that is not in the protected range?

**To Reproduce**
Steps to reproduce the behavior:
1. Start Orbot in VPN mode
2. Orbot gets stuck bootstrapping at ~10% every time.

**Expected Behavior**
VPN mode should work on all devices

**What Custom Configuration Do You Use?**
If applicable, how did you set up Orbot? Did you configure some settings?

**Screenshots**
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**Smartphone (please complete the following information):**
- Device: T813
- OS: Nougat
- Version: f634bdcab1e3e968e6cd37b22b351e669047a1d4

**Crash Logs (Advanced)**
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**Additional Context**
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