themes: get rid of the unused vertical selector buttons, simplify and rename the horizontal toggle strip

styles/z-bolt/style.css

@@ -134,15 +134,13 @@ textview .time {
     background-color: @bg;
 }
 
-.distbutton_active {
+.horizontal_togglebuttons_active {
     background-color: @active;
     border-color: @color1;
-    box-shadow: 0 0 0 .2em @text inset;
+    box-shadow: 0 0 0 .2em @lines inset;
 }
 
-.distbutton_top,
-.distbutton,
-.distbutton_bottom {
+.horizontal_togglebuttons {
     border-color: @lines;
 }
 
@@ -158,16 +156,6 @@ textview .time {
     border-color: @lines;
 }
 
-.tempbutton_top {
-    border-color: @lines;
-}
-
-.tempbutton,
-.tempbutton_bottom {
-    border-color: @lines;
-    border-top-color: @lines;
-}
-
 .message {
     border-color: @error;
     color: @text;