fix(icon): 添\u52a0 getShortXIconDrawable 方法和占位符，\u4fee\u590d\u56fe\u6807\u4e0d\u663e\u793a

- 补\u5145\u7f3a\u5931的 getShortXIconDrawable() 方法
- 图\u6807\u83b7\u53d6\u5931\u8d25\u65f6\u663e\u793a\u6d45\u8272\u5360\u4f4d\u7b26

code/th_06_icon_parser.js

@@ -436,6 +436,15 @@ FloatBallAppWM.prototype.resolveShortXDrawable = function(name, tintHex) {
   return null;
 };
 
+FloatBallAppWM.prototype.getShortXIconDrawable = function(name) {
+  try {
+    return this.resolveShortXDrawable(name, null);
+  } catch (e) {
+    safeLog(this.L, 'w', "getShortXIconDrawable failed: " + String(e));
+    return null;
+  }
+};
+
 FloatBallAppWM.prototype.getShortXIconCatalog = function(forceReload) {
   if (!forceReload && this._shortxIconCatalog) return this._shortxIconCatalog;
   var out = [];