Remove parentheses for consistency

Author: hankluo6

src/lpython/parser/tokenizer.re

@@ -89,7 +89,7 @@ void lex_int(Allocator &al, const unsigned char *s,
         s = s + 2;
         uint64_t n = get_value((char*)s, 2, loc);
         u.from_smallint(n);
-    } else if ((std::tolower(s[1]) == 'o')) {
+    } else if (std::tolower(s[1]) == 'o') {
         // Oct
         s = s + 2;
         uint64_t n = get_value((char*)s, 8, loc);