Allow all LEB128 encodings of zero for table index

Even without reference types, the table index can be encoded in multiple
ways (e.g. `0x80 0x00`). This fixes the handling of these (valid) files
by always reading the table index as a LEB128.

Author: hybrist

core/iwasm/interpreter/wasm_loader.c

@@ -12082,12 +12082,7 @@ wasm_loader_prepare_bytecode(WASMModule *module, WASMFunction *func,
                 WASMFuncType *func_type;
 
                 read_leb_uint32(p, p_end, type_idx);
-#if WASM_ENABLE_REF_TYPES != 0 || WASM_ENABLE_GC != 0
                 read_leb_uint32(p, p_end, table_idx);
-#else
-                CHECK_BUF(p, p_end, 1);
-                table_idx = read_uint8(p);
-#endif
                 if (!check_table_index(module, table_idx, error_buf,
                                        error_buf_size)) {
                     goto fail;

core/iwasm/interpreter/wasm_mini_loader.c

@@ -6592,12 +6592,7 @@ wasm_loader_prepare_bytecode(WASMModule *module, WASMFunction *func,
 
                 read_leb_uint32(p, p_end, type_idx);
 
-#if WASM_ENABLE_REF_TYPES != 0
                 read_leb_uint32(p, p_end, table_idx);
-#else
-                CHECK_BUF(p, p_end, 1);
-                table_idx = read_uint8(p);
-#endif
                 if (!check_table_index(module, table_idx, error_buf,
                                        error_buf_size)) {
                     goto fail;