Fix wrong attribute and method name usage (#13515)

Author: anaximeno

data/theme/cinnamon-sass/widgets/_base.scss

@@ -100,7 +100,7 @@ StScrollBar {
 
   StBin#trough {
     background-color: transparentize($base_color, 0.9);
-    border_radius: $base_border_radius;
+    border-radius: $base_border_radius;
   }
 
   StButton#vhandle,

data/theme/cinnamon-sass/widgets/_dialogs.scss

@@ -65,7 +65,7 @@
 
     .dialog-list-title {
       color: $warning_color;
-      background-color: tranparentize($warning_color, 0.9);
+      background-color: transparentize($warning_color, 0.9);
       padding: $base_padding * 1.5;
       border-radius: $base_border_radius;
       margin: $base_margin 0;