8334599: Improve code from JDK-8302671

Reviewed-by: aivanov, stuefe, prr

Author: TheShermanTanker

src/java.desktop/windows/native/libawt/windows/awt_Component.cpp

@@ -3362,10 +3362,10 @@ BOOL AwtComponent::IsNumPadKey(UINT vkey, BOOL extended)
     return FALSE;
 }
 static void
-resetKbdState( BYTE kstate[256]) {
-    BYTE tmpState[256];
+resetKbdState( BYTE (&kstate)[AwtToolkit::KB_STATE_SIZE]) {
+    BYTE tmpState[AwtToolkit::KB_STATE_SIZE];
     WCHAR wc[2];
-    memmove(tmpState, kstate, 256 * sizeof(BYTE));
+    memmove(tmpState, kstate, sizeof(kstate));
     tmpState[VK_SHIFT] = 0;
     tmpState[VK_CONTROL] = 0;
     tmpState[VK_MENU] = 0;