Fix slice.has_prefix & slice.has_suffix

The needle was the element type instead of the slice type.

core/slice/slice.odin

@@ -222,7 +222,7 @@ prefix_length :: proc(a, b: $T/[]$E) -> (n: int) where intrinsics.type_is_compar
 }
 
 @(require_results)
-has_prefix :: proc(array: $T/[]$E, needle: E) -> bool where intrinsics.type_is_comparable(E) {
+has_prefix :: proc(array: $T/[]$E, needle: T) -> bool where intrinsics.type_is_comparable(E) {
 	n := len(needle)
 	if len(array) >= n {
 		return equal(array[:n], needle)
@@ -232,7 +232,7 @@ has_prefix :: proc(array: $T/[]$E, needle: E) -> bool where intrinsics.type_is_c
 
 
 @(require_results)
-has_suffix :: proc(array: $T/[]$E, needle: E) -> bool where intrinsics.type_is_comparable(E) {
+has_suffix :: proc(array: $T/[]$E, needle: T) -> bool where intrinsics.type_is_comparable(E) {
 	array := array
 	m, n := len(array), len(needle)
 	if m >= n {