Fix the behavior of preference in IME Settings

Change-Id: I41f7c36fb73730248dcc98abbf4276ef6d772f36

src/com/android/settings/inputmethod/InputMethodPreference.java

@@ -104,6 +104,7 @@ public class InputMethodPreference extends CheckBoxPreference
         mSummaryText = (TextView)view.findViewById(android.R.id.summary);
         final boolean hasSubtypes = mImi.getSubtypeCount() > 1;
         final String imiId = mImi.getId();
+        if (hasSubtypes) {
             mInputMethodPref.setOnLongClickListener(new OnLongClickListener() {
                 @Override
                 public boolean onLongClick(View arg0) {
@@ -114,6 +115,7 @@ public class InputMethodPreference extends CheckBoxPreference
                     return true;
                 }
             });
+        }
 
         if (mSettingsIntent != null) {
             mInputMethodSettingsButton.setOnClickListener(