Supress a warning in GammaBoost.kt

Signed-off-by: Username404 <w.iron.zombie@gmail.com>

common/src/main/kotlin/fr/username404/snowygui/gui/feature/GammaBoost.kt

@@ -10,6 +10,7 @@ object GammaBoost: ButtonImpl() {
     override fun execAction() {
         with(Minecraft.getInstance().options) {
             val gamma = gamma().get()
+            @Suppress("KotlinConstantConditions")
             (gamma() as OptionValueAccessor).setValue(if (toggled) {
                 if (gamma < boost) oldGamma = gamma
                 boost