Misc fixes for module build

v2/internal/app/default.go

@@ -8,6 +8,7 @@ package app
 // will be unknown and the application will not work as expected.
 
 import (
+	"github.com/wailsapp/wails/v2/internal/logger"
 	"os"
 
 	"github.com/wailsapp/wails/v2/pkg/options"
@@ -22,6 +23,8 @@ type App struct {
 
 	// Indicates if the app is running in debug mode
 	debug bool
+
+	logger *logger.Logger
 }
 
 // CreateApp returns a null application

v2/internal/runtime/system_default.go

@@ -0,0 +1,8 @@
+// +build !desktop,!server
+
+package runtime
+
+// AppType returns the application type, EG: desktop
+func (r *system) AppType() string {
+	return "default"
+}