imm32: Mask the scancode before passing it to ImeToAsciiEx.

dlls/imm32/imm.c

@@ -3099,7 +3099,7 @@ BOOL WINAPI ImmTranslateMessage( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lpar
     if ((vkey = data->vkey) == VK_PROCESSKEY) return FALSE;
     data->vkey = VK_PROCESSKEY;
     GetKeyboardState( state );
-    scan = lparam >> 0x10;
+    scan = (lparam >> 0x10) & 0xffff;
 
     if (ime->info.fdwProperty & IME_PROP_KBD_CHAR_FIRST)
     {

dlls/imm32/tests/imm32.c

@@ -7044,7 +7044,6 @@ static void test_ImmTranslateMessage( BOOL kbd_char_first )
             .hkl = expect_ime, .himc = default_himc, .func = IME_TO_ASCII_EX,
             /* FIXME what happened to kbd_char_first here!? */
             .to_ascii_ex = {.vkey = 'Q', .vsc = 0xc010},
-            .todo_value = TRUE,
         },
         {0},
     };