Update knob component defaults and clean up unused code

Adjusted the default value, minValue, and step for the volume knob to improve precision. Removed unused `KnobBackgroundCls` and cleaned up unnecessary whitespace for better readability and maintainability.

src/jsMain/kotlin/nl/astraeus/vst/ui/components/BaseKnobComponent.kt

@@ -159,7 +159,6 @@ open class BaseKnobComponent(
             KnobVolumeBackgroundCls.name
           )
         }
-
       }
 
       span(KnobTextCls.name) {
@@ -201,6 +200,7 @@ open class BaseKnobComponent(
           activated = false
         }
       }
+
     }
   }
 
@@ -313,7 +313,6 @@ open class BaseKnobComponent(
     object KnobSvgCls : CssName()
     object KnobTextCls : CssName()
     object KnobValueCls : CssName()
-    object KnobBackgroundCls : CssName()
 
     object KnobVolumeCls : CssName()
     object KnobVolumeBackgroundCls : CssName()