Factorize --list- options handling

This will limit code duplication as more list options will be added.

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

@@ -153,6 +153,10 @@ public class Options {
         return powerOn;
     }
 
+    public boolean getList() {
+        return listEncoders || listDisplays;
+    }
+
     public boolean getListEncoders() {
         return listEncoders;
     }

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

@@ -180,7 +180,7 @@ public final class Server {
 
         Ln.initLogLevel(options.getLogLevel());
 
-        if (options.getListEncoders() || options.getListDisplays()) {
+        if (options.getList()) {
             if (options.getCleanup()) {
                 CleanUp.unlinkSelf();
             }