clear keyboard cache when needed

app/src/main/java/helium314/keyboard/latin/LatinIME.java

@@ -1983,6 +1983,7 @@ public class LatinIME extends InputMethodService implements
     private void reloadIfNecessary() {
         // better do the reload when showing the keyboard next time, and not on settings change
         if (SettingsActivityKt.keyboardNeedsReload) {
+            KeyboardLayoutSet.onKeyboardThemeChanged();
             mKeyboardSwitcher.forceUpdateKeyboardTheme(mDisplayContext);
             SettingsActivityKt.keyboardNeedsReload = false;
         }

app/src/main/java/helium314/keyboard/settings/SettingsActivity.kt

@@ -17,7 +17,6 @@ import kotlinx.coroutines.flow.MutableStateFlow
 //  make all prefs actually work
 //   appearance
 //    click on bg image does nothing when already set (but works after reload)
-//    split spacer scale setting does not reload?
 //    narrow key gaps setting is not changing properly?
 //    custom font loading not implemented
 //    have large bg image, and first-time load the keyboard on new search field -> bg image expands full size