Should not show loading animation after size loading complete

SettingsPreferenceFragment#setLoading(boolean loading, boolean animate)
shows loading animation when 'animate' parameter is true.

This change sets 'animate' parameter false to fix this issue.

Bug: 254003456
Test: manual visual
      Settings -> Storage -> Free up space -> back
      then see if loading animation shows.
Change-Id: Ic804bcf950a9c57297ccefd6e942edea0b792a3b