(LowPass) Change enable value, update docs. (lavalink-devs#673)

* LowPass: enforce minimum, change enable value, update docs.

* Remove coercing to allow the filter to actually be disabled.

* Bump lowpass minimum to 1.0f

* Enforce >1.0

IMPLEMENTATION.md

@@ -223,8 +223,9 @@ Note that filters may take a moment to apply.
     }
 
     // Higher frequencies get suppressed, while lower frequencies pass through this filter, thus the name low pass.
+    // Any smoothing values equal to, or less than 1.0 will disable the filter.
     "lowPass": {
-        "smoothing": 20.0
+        "smoothing": 20.0 // 1.0 < x
     }
 }
 ```

LavalinkServer/src/main/java/lavalink/server/player/filters/filterConfigs.kt

@@ -164,7 +164,7 @@ class LowPassConfig(
             .setSmoothing(smoothing)
     }
 
-    override val isEnabled: Boolean get() = smoothing != 20.0f
+    override val isEnabled: Boolean get() = smoothing > 1.0f
 }
 
 abstract class FilterConfig {