state: store launch method instead of launcher path

Launcher path is constant for each launch method on the same system.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

internal/state/state.go

@@ -33,8 +33,8 @@ type State struct {
 	// capability enablements applied to child
 	Capability system.Enablements
 
-	// resolved launcher path
-	Launcher string
+	// user switch method
+	Method string
 	// full argv whe launching
 	Argv []string
 	// process start time