Remove hardcode for textcolor in spinner item.

Remove the "android:textcolor" because "Android:textAppearance"
will set the textcolor to "?attr/textColorPrimary".
Set adapter has same theme as spinner, so view inside adapter
can be inflatered correctly.

Bug: 32592245
Test: screenshot
Change-Id: If7a78ede0a029aa9fcd8f9b324a423d477c65ad7

src/com/android/settings/datausage/DataUsageList.java

@@ -147,7 +147,8 @@ public class DataUsageList extends DataUsageBase {
 
         mHeader = setPinnedHeaderView(R.layout.apps_filter_spinner);
         mCycleSpinner = (Spinner) mHeader.findViewById(R.id.filter_spinner);
-        mCycleAdapter = new CycleAdapter(getContext(), new CycleAdapter.SpinnerInterface() {
+        mCycleAdapter = new CycleAdapter(mCycleSpinner.getContext(),
+                new CycleAdapter.SpinnerInterface() {
             @Override
             public void setAdapter(CycleAdapter cycleAdapter) {
                 mCycleSpinner.setAdapter(cycleAdapter);