Fix MapPalette.getColor(byte) to use correct ranges for 1.12 color array

By: Nathan Wolf <nathan@elmakers.com>

paper-api/src/main/java/org/bukkit/map/MapPalette.java

@@ -246,7 +246,7 @@ public final class MapPalette {
      */
     @Deprecated
     public static Color getColor(byte index) {
-        if ((index > -113 && index < 0) || index > 127) {
+        if ((index > -49 && index < 0) || index > 127) {
             throw new IndexOutOfBoundsException();
         } else {
             // Minecraft has 143 colors, some of which have negative byte representations