Revert "CM11 Themes: Allow defining a custom default theme [1/3]"

This reverts commit c86d92a2b1656220f3cf7b5870a0863dddde43e1.
CM11 Themes: Allow defining a custom default theme [1/3]

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conflicts:
DatabaseHelper.java
defaults.xml
Settings.java
ThemeService.java
ThemeUtils.java

Change-Id: I6b794d6c9c27b2d6436bdf4fec51c84a7859c134