Prepare the main looper earlier

The looper must be initialized before listing apps, to avoid the
following error:

> Can't create handler inside thread that has not called
> Looper.prepare()

Refs 283326b2f6
Fixes #6165 <https://github.com/Genymobile/scrcpy/issues/6165>

server/src/main/java/com/genymobile/scrcpy/Server.java

@@ -97,7 +97,6 @@ public final class Server {
         boolean audio = options.getAudio();
         boolean sendDummyByte = options.getSendDummyByte();
 
-        prepareMainLooper();
         Workarounds.apply();
 
         List<AsyncProcessor> asyncProcessors = new ArrayList<>();
@@ -230,6 +229,8 @@ public final class Server {
             Ln.e("Exception on thread " + t, e);
         });
 
+        prepareMainLooper();
+
         Options options = Options.parse(args);
 
         Ln.disableSystemStreams();