Spell "unknown" correctly

(cherry picked from commit ee377793fe0e45014288cf6b46f2309aa5c55cf6)

android-project/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -89,7 +89,7 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
                 | InputDevice.SOURCE_CLASS_POSITION
                 | InputDevice.SOURCE_CLASS_TRACKBALL);
 
-        if (s2 != 0) cls += "Some_Unkown";
+        if (s2 != 0) cls += "Some_Unknown";
 
         s2 = s_copy & InputDevice.SOURCE_ANY; // keep source only, no class;
 
@@ -163,7 +163,7 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
         if (s == FLAG_TAINTED) src += " FLAG_TAINTED";
         s2 &= ~FLAG_TAINTED;
 
-        if (s2 != 0) src += " Some_Unkown";
+        if (s2 != 0) src += " Some_Unknown";
 
         Log.v(TAG, prefix + "int=" + s_copy + " CLASS={" + cls + " } source(s):" + src);
     }