Remove unused code

app/src/main/java/com/hippo/widget/TextClock.java

@@ -23,7 +23,6 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.database.ContentObserver;
 import android.net.Uri;
-import android.os.Build;
 import android.os.Handler;
 import android.os.SystemClock;
 import android.provider.Settings;
@@ -42,10 +41,7 @@ public class TextClock extends AppCompatTextView {
     public static final CharSequence DEFAULT_FORMAT_24_HOUR;
 
     static {
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR2)
-            DEFAULT_FORMAT_24_HOUR = "kk:mm";
-        else
-            DEFAULT_FORMAT_24_HOUR = "HH:mm";
+        DEFAULT_FORMAT_24_HOUR = "HH:mm";
     }
 
     private CharSequence mFormat12;