[gnome-themes-standard] Fixed dark theme metafiles.

[Juraj Fiala <jurf src gnome org>]

commit bf146e3ba9da90e214873ee7e9b2a0f32f6e8388
Author: Juraj Fiala <doctorjellyface riseup net>
Date:   Fri Nov 25 19:22:47 2016 +0100

    Fixed dark theme metafiles.
    
    The index file for the dark theme was the same as the light theme,
    meaning gnome-tweak-tool wouldn't pick it up. Also the index.theme file
    has been removed, since it's generated when building.

 themes/Adwaita-dark/index.theme    |  152 ------------------------------------
 themes/Adwaita-dark/index.theme.in |    6 +-
 2 files changed, 3 insertions(+), 155 deletions(-)
---
diff --git a/themes/Adwaita-dark/index.theme.in b/themes/Adwaita-dark/index.theme.in
index 4cd0690..db2c591 100644
--- a/themes/Adwaita-dark/index.theme.in
+++ b/themes/Adwaita-dark/index.theme.in
@@ -1,9 +1,9 @@
 [X-GNOME-Metatheme]
-_Name=Adwaita
+_Name=Adwaita-dark
 Type=X-GNOME-Metatheme
-_Comment=There is only one
+_Comment=There was only one
 Encoding=UTF-8
-GtkTheme=Adwaita
+GtkTheme=Adwaita-dark
 MetacityTheme=Adwaita
 IconTheme=Adwaita
 CursorTheme=Adwaita