Fix issue 2141503: Keyclick sound doesn't honor volume settings.

Align sound effect volume on music volume.
diff --git a/src/com/android/inputmethod/pinyin/SoundManager.java b/src/com/android/inputmethod/pinyin/SoundManager.java
index 82be407..5953011 100644
--- a/src/com/android/inputmethod/pinyin/SoundManager.java
+++ b/src/com/android/inputmethod/pinyin/SoundManager.java
@@ -26,7 +26,8 @@
     private static SoundManager mInstance = null;
     private Context mContext;
     private AudioManager mAudioManager;
-    private final float FX_VOLUME = 1.0f;
+    // Align sound effect volume on music volume
+    private final float FX_VOLUME = -1.0f;
     private boolean mSilentMode;
 
     private SoundManager(Context context) {