src/settings.vala: remove default_theme_name_ private variable.

This functionality doesn't make sense, for two reasons:
  - If we query the gtk-theme-name property before setting anything
    else, we will certainly get the default theme name. But that is
    hardcoded in GTK and not exactly secret. It can't be configured
    directly, only by changing specific macros in GTK's source code and
    recompiling it. The chances of someone doing that are... very small.
    Thus, we can also just hardcode "Adwaita" in AG.
  - If we query the gtk-theme-name property after setting it to a
    different value... we will fetch the value we just set. That's
    totally useless. My initial idea was that GTK is doing some input
    sanitization on the provided theme name and handles an invalid name
    by falling back to its built-in default and setting the
    gtk-theme-name property to this built-in default as well. This,
    however, is not true. Setting an invalid theme name will just mean
    that GTK will fail loading the new theme and stay on whatever theme
    it was before, copying the new value to the gtk-theme-name property
    regardless. Unfortunately, querying the property is not something we
    could use for error handling, which makes it completely useless.

It's better to just get rid of this.

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