vfmt: handle fixed size arrays

vlib/v/fmt/fmt.v

@@ -1042,6 +1042,10 @@ fn (mut f Fmt) array_init(it ast.ArrayInit) {
 		f.indent--
 	}
 	f.write(']')
+	// `[100]byte`
+	if it.is_fixed {
+		f.write(f.type_to_str(it.elem_type))
+	}
 }
 
 fn (mut f Fmt) struct_init(it ast.StructInit) {

vlib/v/fmt/tests/array_newlines_keep.vv

@@ -11,4 +11,5 @@ fn main() {
 	]
 	x := []int{len: 10, cap: 100, init: 1}
 	_ := expected_flags
+	buf := [100]byte
 }