Fix doxygen warnings, enums can only be in 1 group

docs/user/interface/Alert.dox

@@ -22,7 +22,6 @@
 /*!
 	\enum alert_type
 	\ingroup interface
-	\ingroup libbe
 
 	Determines which icon (if any) is displayed in the alert dialog.
 	Choose one option. If the constructor doesn't include an
@@ -70,7 +69,6 @@
 /*!
 	\enum button_spacing
 	\ingroup interface
-	\ingroup libbe
 
 	Determines how the buttons on the alert dialog are spaced relative
 	to each other. Choose one option. If the constructor doesn't include a

docs/user/interface/ColorControl.dox

@@ -22,7 +22,6 @@
 /*!
 	\enum color_control_layout
 	\ingroup interface
-	\ingroup libbe
 
 	Enumeration of the color control layout options.
 */

docs/user/interface/Font.dox

@@ -54,7 +54,6 @@
 /*!
 	\enum font_direction
 	\ingroup interface
-	\ingroup libbe
 
 	Determines the direction of the text rendered by the font,
 	left-to-right or right-to-left.
@@ -305,7 +304,6 @@
 /*!
 	\enum font_file_format
 	\ingroup interface
-	\ingroup libbe
 
 	Font file format, TrueType™ or PostScript™ Type1.
 

docs/user/interface/InterfaceDefs.dox

@@ -22,7 +22,6 @@
 /*!
 	\enum border_style
 	\ingroup interface
-	\ingroup libbe
 
 	Collection of flags that determine the border style drawn around a BBox.
 */