Replace FX_UINT with unsigned int

fpdfsdk/formfiller/cffl_listbox.cpp

Index: fpdfsdk/formfiller/cffl_listbox.cpp
diff --git a/fpdfsdk/formfiller/cffl_listbox.cpp b/fpdfsdk/formfiller/cffl_listbox.cpp
index e9627cb4e440eb8a37e09ecddb81b661c246c828..a089432477689aaa8411df1c7dc7c6bee4d9d46c 100644
--- a/fpdfsdk/formfiller/cffl_listbox.cpp
+++ b/fpdfsdk/formfiller/cffl_listbox.cpp
@@ -83,8 +83,8 @@ CPWL_Wnd* CFFL_ListBox::NewPDFWindow(const PWL_CREATEPARAM& cp,
 }
 
 FX_BOOL CFFL_ListBox::OnChar(CPDFSDK_Annot* pAnnot,
-                             FX_UINT nChar,
-                             FX_UINT nFlags) {
+                             uint32_t nChar,
+                             uint32_t nFlags) {
   return CFFL_FormFiller::OnChar(pAnnot, nChar, nFlags);
 }