Add missed file generated by optional_scalar.fbs (#6125)

tests/optional_scalars/OptionalByte.kt

@@ -0,0 +1,14 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package optional_scalars
+
+@Suppress("unused")
+@ExperimentalUnsignedTypes
+class OptionalByte private constructor() {
+    companion object {
+        const val None: Byte = 0
+        const val One: Byte = 1
+        val names : Array<String> = arrayOf("None", "One")
+        fun name(e: Int) : String = names[e]
+    }
+}