Fix MSVC compiler warnings about non-ASCII characters in the source

Best not to use non-ASCII/UTF-8 characters in source code.

Fixes compiler warnings with MSVC on windows:

wels_common_basis.h: warning C4828: The file contains a character
 starting at offset 0x26b1 that is illegal in the current source
 character set (codepage 65001).

wels_common_basis.h: warning C4828: The file contains a character
 starting at offset 0x2797 that is illegal in the current source
 character set (codepage 65001).

codec/decoder/core/inc/wels_common_basis.h

@@ -275,15 +275,15 @@ static const SPartMbInfo g_ksInterBMbTypeInfo[] = {
  { MB_TYPE_8x8 | MB_TYPE_P0L0 | MB_TYPE_P0L1 | MB_TYPE_P1L0 | MB_TYPE_P1L1, 4, 4 } //B_8x8
 };
 
-//Table 7.17 – Sub-macroblock types in B macroblocks.
+//Table 7.17 Sub-macroblock types in B macroblocks.
 static const SPartMbInfo g_ksInterPSubMbTypeInfo[4] = {
  {SUB_MB_TYPE_8x8, 1, 2},
  {SUB_MB_TYPE_8x4, 2, 2},
  {SUB_MB_TYPE_4x8, 2, 1},
  {SUB_MB_TYPE_4x4, 4, 1},
 };
 
-//Table 7.18 – Sub-macroblock types in B macroblocks.
+//Table 7.18 Sub-macroblock types in B macroblocks.
 static const SPartMbInfo g_ksInterBSubMbTypeInfo[] = {
  { MB_TYPE_DIRECT, 1, 2 }, //B_Direct_8x8
  { SUB_MB_TYPE_8x8 | MB_TYPE_P0L0, 1, 2 }, //B_L0_8x8