refactor: List background color

ClashX Dashboard/Views/APISetting/APISettingView.swift

@@ -5,6 +5,7 @@
 //
 
 import SwiftUI
+import Introspect
 
 struct APISettingView: View {
 	@State var baseURL: String = ""
@@ -61,6 +62,10 @@ struct APISettingView: View {
 					}
 				}
 			}
+			.introspectTableView {
+				$0.backgroundColor = NSColor.clear
+				$0.enclosingScrollView?.drawsBackground = false
+			}
 		}
 		.padding(.top)
 		.fixedSize(horizontal: true, vertical: false)

ClashX Dashboard/Views/ClearBackgroundList.swift

@@ -1,16 +0,0 @@
-//
-//  ClearBackgroundList.swift
-//  ClashX Dashboard
-//
-//
-
-import Foundation
-import SwiftUI
-
-extension NSTableView {
-	open override func viewWillMove(toWindow newWindow: NSWindow?) {
-		super.viewDidMoveToWindow()
-		backgroundColor = NSColor.clear
-		enclosingScrollView!.drawsBackground = false
-	}
-}