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

styles/material-light/style.css

@@ -134,10 +134,6 @@ entry {
     background-color: @bg;
 }
 
-.frame-item {
-    border-bottom-color: @border;
-}
-
 label {
     color: @text;
 }
@@ -195,26 +191,16 @@ textview .time {
     color: @border;
 }
 
-.dialog {
-    border: @border;
-    background-color: @bg;
-}
-
-.tempbutton_top,
-.tempbutton,
-.tempbutton_bottom,
-.distbutton_top,
-.distbutton,
-.distbutton_bottom  {
+.horizontal_togglebuttons  {
     border-color: @border;
     background-color: @bg;
 }
 
-.distbutton_active {
+.horizontal_togglebuttons_active {
     background-color: @active;
 }
 
-.distbutton_active label {
+.horizontal_togglebuttons_active label {
     color: @text;
 }
 
@@ -222,6 +208,10 @@ textview .time {
     color: @bg;
 }
 
+.frame-item {
+    border-bottom-color: @border;
+}
+
 .message_popup {
     border-bottom-color: @border;
 }
@@ -281,6 +271,11 @@ textview .time {
     background-color: @border;
 }
 
+.dialog {
+    border: @border;
+    background-color: @bg;
+}
+
 .dialog button {
     border-radius: .75em;
 }