minor fixes to Darwin process tree

Author: matthewbastien

lldb/tools/lldb-dap/src-ts/process-tree/platforms/darwin-process-tree.ts

@@ -1,15 +1,11 @@
 import { LinuxProcessTree } from "./linux-process-tree";
 
-function fill(prefix: string, suffix: string, length: number): string {
-  return prefix + suffix.repeat(length - prefix.length);
-}
-
 export class DarwinProcessTree extends LinuxProcessTree {
   protected override getCommandArguments(): string[] {
     return [
-      "-xo",
+      "-axo",
       // The length of comm must be large enough or data will be truncated.
-      `pid=PID,lstart=START,comm=${fill("COMMAND", "-", 256)},command=ARGUMENTS`,
+      `pid=PID,lstart=START,comm=${"COMMAND".padEnd(256, "-")},args=ARGUMENTS`,
     ];
   }
 }