Always show at least 1% when some space used.

Don't let the progress value round down to 0, since that would
be misleading.

Test: builds
Bug: 24017703
Change-Id: I6a0268361645da16af67e12bf7f6823d027dd72c

src/com/android/settings/deviceinfo/PrivateVolumeSettings.java

@@ -269,7 +269,7 @@ public class PrivateVolumeSettings extends SettingsPreferenceFragment {
                 result.value, result.units));
         mSummary.setSummary(getString(R.string.storage_volume_used,
                 Formatter.formatFileSize(context, mTotalSize)));
-        mSummary.setPercent((int) ((usedBytes * 100) / mTotalSize));
+        mSummary.setPercent(usedBytes, mTotalSize);
 
         mMeasure.forceMeasure();
         mNeedsUpdate = false;