Introduce constants for default OSC config values

app/src/main/java/emu/skyline/input/onscreen/OnScreenButton.kt

@@ -243,6 +243,6 @@ abstract class OnScreenButton(
     open fun resetConfig() {
         resetRelativeValues()
         config.enabled = true
-        config.scale = 0f
+        config.scale = OnScreenConfiguration.DefaultScale
     }
 }

app/src/main/java/emu/skyline/input/onscreen/OnScreenConfiguration.kt

@@ -11,24 +11,30 @@ import emu.skyline.utils.SwitchColors
 import emu.skyline.utils.sharedPreferences
 
 class OnScreenConfiguration(private val context : Context, private val buttonId : ButtonId, defaultRelativeX : Float, defaultRelativeY : Float) {
+    companion object {
+        const val DefaultAlpha = 130
+        const val DefaultGlobalScale = 1.15f
+        const val DefaultScale = 0.0f
+    }
+
     private inline fun <reified T> config(default : T, prefix : String = "${buttonId.name}_") = sharedPreferences(context, default, prefix, "controller_config")
 
     var enabled by config(true)
 
-    var alpha by config(155, "")
+    var alpha by config(DefaultAlpha, "")
     var textColor by config(SwitchColors.BLACK.color)
     var backgroundColor by config(SwitchColors.WHITE.color)
 
     /**
      * The global scale applied to all buttons
      */
-    var globalScale by config(1.15f, "")
+    var globalScale by config(DefaultGlobalScale, "")
 
     /**
      * The scale of each button, this is added to the global scale
      * Allows buttons to have their own size, while still be controlled by the global scale
      */
-    var scale by config(0.0f)
+    var scale by config(DefaultScale)
 
     var relativeX by config(defaultRelativeX)
     var relativeY by config(defaultRelativeY)

app/src/main/java/emu/skyline/input/onscreen/OnScreenControllerView.kt

@@ -271,8 +271,8 @@ class OnScreenControllerView @JvmOverloads constructor(context : Context, attrs
         controls.allButtons.forEach {
             it.resetConfig()
         }
-        controls.globalScale = 1.15f
-        controls.alpha = 155
+        controls.globalScale = OnScreenConfiguration.DefaultGlobalScale
+        controls.alpha = OnScreenConfiguration.DefaultAlpha
         invalidate()
     }