Fix conflicting shorthand switch -w for pwsh (#12945)

src/Microsoft.PowerShell.ConsoleHost/host/msh/CommandLineParameterParser.cs

@@ -858,7 +858,7 @@ namespace Microsoft.PowerShell
 #if DEBUG
                 // this option is useful when debugging ConsoleHost remotely using VS remote debugging, as you can only
                 // attach to an already running process with that debugger.
-                else if (MatchSwitch(switchKey, "wait", "w"))
+                else if (MatchSwitch(switchKey, "wait", "wa"))
                 {
                     // This does not need to be localized: its chk only