fix(progress): wider bar min width

When a progress is very short, the bar could contain a value > "10%" which then does not completely fit into the bar anymore.
By slightly increasing the min-width, this should cover almost every usecase.

src/themes/default/modules/progress.variables

@@ -28,7 +28,7 @@
     width @barTransitionDuration @barTransitionEasing,
     background-color @barTransitionDuration @barTransitionEasing;
 @barInitialWidth: 0;
-@barMinWidth: 2em;
+@barMinWidth: 2.5em;
 
 /* Progress Bar Label */
 @progressWidth: auto;