update swift extension name and cleanup script [skip ci]

Author: eagleoflqj

.vscode/extensions.json

@@ -1,6 +1,6 @@
 {
     "recommendations": [
         "llvm-vs-code-extensions.vscode-clangd",
-        "sswg.swift-lang"
+        "swiftlang.swift-vscode"
     ]
 }

assets/update.sh

@@ -8,7 +8,7 @@ APP_DIR="$INSTALL_DIR/Fcitx5.app"
 RESOURCES_DIR="$APP_DIR/Contents/Resources"
 
 # Don't remove files that must exist (which will be overwritten) as that will put Fcitx5 in a registered-but-not-listed state.
-rm -rf "$APP_DIR"/Contents/{bin,lib,share,Resources}
+rm -rf "$APP_DIR"/Contents/{bin,include,lib,share,Resources}
 if ls "$APP_DIR"/Contents/MacOS/Fcitx5.*; then # Debug symbols
     rm -rf "$APP_DIR"/Contents/MacOS/Fcitx5.*
 fi