Remove enabledFeatures from the default configuration; it is useless

(cherry picked from commit c1cb690fe2404889b54373c4399d22b381abfc57)

common/src/main/kotlin/fr/username404/snowygui/config/Configuration.kt

@@ -52,9 +52,6 @@ object Configuration {
                 """
                     |Snowy {
                     |  displayInitMessage = true
-                    |  enabledFeatures {
-                    |    GammaBoost = false
-                    |  }
                     |}
                 """.trimMargin()
             )
@@ -81,4 +78,4 @@ object Configuration {
             }
         )
     }
-}
+}