builtin: remove unnecessary casts for defunct small unsigned warning (#14108)

vlib/builtin/js/map_test.js.v

@@ -775,7 +775,7 @@ fn test_byte_keys() {
 		m[i]++
 		assert m[i] == i + 1
 	}
-	assert m.len == int(byte_max)
+	assert m.len == byte_max
 	keys := m.keys()
 	for i in u8(0) .. byte_max {
 		assert keys[i] == i
@@ -827,7 +827,7 @@ fn test_u16_keys() {
 		m[i]++
 		assert m[i] == i + 1
 	}
-	assert m.len == int(end)
+	assert m.len == end
 	keys := m.keys()
 	for i in u16(0) .. end {
 		assert keys[i] == i

vlib/builtin/map_test.v

@@ -763,7 +763,7 @@ fn test_byte_keys() {
 		m[i]++
 		assert m[i] == i + 1
 	}
-	assert m.len == int(byte_max)
+	assert m.len == byte_max
 	keys := m.keys()
 	for i in u8(0) .. byte_max {
 		assert keys[i] == i
@@ -815,7 +815,7 @@ fn test_u16_keys() {
 		m[i]++
 		assert m[i] == i + 1
 	}
-	assert m.len == int(end)
+	assert m.len == end
 	keys := m.keys()
 	for i in u16(0) .. end {
 		assert keys[i] == i

vlib/builtin/string.v

@@ -1937,7 +1937,7 @@ pub fn (name string) match_glob(pattern string) bool {
 						mut is_inverted := false
 						mut inner_match := false
 						mut inner_idx := bstart + 1
-						mut inner_c := u8(0)
+						mut inner_c := 0
 						if inner_idx < plen {
 							inner_c = pattern[inner_idx]
 							if inner_c == `^` {