Fix: string.match bracket pattern

Author: masaedw

src/MoonSharp.Interpreter.Tests/EndToEnd/StringLibTests.cs

@@ -272,6 +272,15 @@ public void String_Match_3()
 			Utils.DynAssert(res, "書籍籍");
 		}
 
+		[Test]
+		public void String_Match_4()
+		{
+			string s = "㍝"; // U+335D
+			string p = "[Aそ]"; // U+005B, U+0041, U+305D, U+005D
+
+			TestMatch(s, p, false);
+		}
+
 		private void TestMatch(string s, string p, bool expected)
 		{
 			Script S = new Script(CoreModules.String);

src/MoonSharp.Interpreter/CoreLib/StringLib/KopiLua_StrLib.cs

@@ -203,10 +203,10 @@ private static int matchbracketclass(int c, CharPtr p, CharPtr ec)
 				else if ((p[1] == '-') && (p + 2 < ec))
 				{
 					p += 2;
-					if ((byte)((p[-2])) <= c && (c <= (byte)p[0]))
+					if (p[-2] <= c && (c <= p[0]))
 						return sig;
 				}
-				else if ((byte)(p[0]) == c) return sig;
+				else if (p[0] == c) return sig;
 			}
 			return (sig == 0) ? 1 : 0;
 		}