Rename the bundled text editor themes for consistency with themes

The Adaptive text editor theme is the default, and has therefore
been renamed Default for consistency with the Default theme preset.
It keeps its automatic dark/light switch status.

The Default text editor theme was actually a legacy Godot 2-style theme,
so it has been renamed to Godot 2 to match the theme preset.
Its background color has been changed to be a constant opaque color,
since the new editor theme made the theme look less good on a translucent
background. The previous background color on light theme also lacked
contrast.

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