fix: flush layout with switching keyboard

Author: Bambooin

app/src/main/java/com/osfans/trime/ime/keyboard/KeyboardView.java

@@ -621,6 +621,7 @@ public void setKeyboard(Keyboard keyboard) {
     List<Key> keys = mKeyboard.getKeys();
     mKeys = keys.toArray(new Key[keys.size()]);
     setKeyboardBackground();
+    requestLayout();
     // Hint to reallocate the buffer if the size changed
     mKeyboardChanged = true;
     invalidateAllKeys();