Revert "Start cleanup process with setsid or nohup"

This reverts commit c59a3c3.

The next commit will use Os.setsid() instead.

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

@@ -10,8 +10,6 @@
 import java.io.File;
 import java.io.IOException;
 import java.io.OutputStream;
-import java.util.ArrayList;
-import java.util.List;
 
 /**
  * Handle the cleanup of scrcpy, even if the main process is killed.
@@ -109,22 +107,16 @@ private void runCleanUp(Options options) {
 
     private void run(int displayId, int restoreStayOn, boolean disableShowTouches, boolean powerOffScreen, int restoreScreenOffTimeout)
             throws IOException {
-
-        List<String> cmd = new ArrayList<>();
-        if (new File("/system/bin/setsid").exists()) {
-            cmd.add("/system/bin/setsid");
-        } else if (new File("/system/bin/nohup").exists()) {
-            cmd.add("/system/bin/nohup");
-        }
-
-        cmd.add("app_process");
-        cmd.add("/");
-        cmd.add(CleanUp.class.getName());
-        cmd.add(String.valueOf(displayId));
-        cmd.add(String.valueOf(restoreStayOn));
-        cmd.add(String.valueOf(disableShowTouches));
-        cmd.add(String.valueOf(powerOffScreen));
-        cmd.add(String.valueOf(restoreScreenOffTimeout));
+        String[] cmd = {
+                "app_process",
+                "/",
+                CleanUp.class.getName(),
+                String.valueOf(displayId),
+                String.valueOf(restoreStayOn),
+                String.valueOf(disableShowTouches),
+                String.valueOf(powerOffScreen),
+                String.valueOf(restoreScreenOffTimeout),
+        };
 
         ProcessBuilder builder = new ProcessBuilder(cmd);
         builder.environment().put("CLASSPATH", Server.SERVER_PATH);