Add com_android_wm_shell_flags_lib to desktopmode static_libs

This is an attempt to fix the crash for failed resolution of: com/android/window/flags/Flags from com/android/settings/development/DesktopModePreferenceController

Change-Id: I12460ec84dd4e415c5685880e15acf0d7838159a
Bug: 361726908
Test: Presubmit
Flag: EXEMPT minor fix
diff --git a/libs/WindowManager/Shell/Android.bp b/libs/WindowManager/Shell/Android.bp
index a79bc97..94809f2 100644
--- a/libs/WindowManager/Shell/Android.bp
+++ b/libs/WindowManager/Shell/Android.bp
@@ -187,6 +187,9 @@
         "shared/**/desktopmode/*.java",
         "shared/**/desktopmode/*.kt",
     ],
+    static_libs: [
+        "com.android.window.flags.window-aconfig-java",
+    ],
 }
 
 android_library {