Plugins: Fix plugin URL paths on Windows (#28548)

* Plugins: Fix plugin URL paths on Windows

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Plugins: Fix plugin URL paths on Windows

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/plugins/frontend_plugin.go

@@ -54,8 +54,8 @@ func (fp *FrontendPluginBase) setPathsBasedOnApp(app *AppPlugin) {
 
 func (fp *FrontendPluginBase) handleModuleDefaults() {
 	if isExternalPlugin(fp.PluginDir) {
-		fp.Module = filepath.Join("plugins", fp.Id, "module")
-		fp.BaseUrl = filepath.Join("public/plugins", fp.Id)
+		fp.Module = path.Join("plugins", fp.Id, "module")
+		fp.BaseUrl = path.Join("public/plugins", fp.Id)
 		return
 	}
 
@@ -66,8 +66,8 @@ func (fp *FrontendPluginBase) handleModuleDefaults() {
 	currentDir := filepath.Base(fp.PluginDir)
 	// use path package for the following statements
 	// because these are not file paths
-	fp.Module = filepath.Join("app/plugins", fp.Type, currentDir, "module")
-	fp.BaseUrl = filepath.Join("public/app/plugins", fp.Type, currentDir)
+	fp.Module = path.Join("app/plugins", fp.Type, currentDir, "module")
+	fp.BaseUrl = path.Join("public/app/plugins", fp.Type, currentDir)
 }
 
 func isExternalPlugin(pluginDir string) bool {