fmt: remove space in front of ? and ! (#14366)

vlib/io/io_cp_test.v

@@ -8,6 +8,6 @@ fn test_cp() ? {
 	}
 	mut r := io.new_buffered_reader(reader: f)
 	mut stdout := os.stdout()
-	io.cp(mut r, mut stdout) ?
+	io.cp(mut r, mut stdout)?
 	assert true
 }

vlib/io/multi_writer.v

@@ -24,7 +24,7 @@ pub mut:
 // is returned immediately and writing to other writers stops.
 pub fn (mut m MultiWriter) write(buf []u8) ?int {
 	for mut w in m.writers {
-		n := w.write(buf) ?
+		n := w.write(buf)?
 		if n != buf.len {
 			return error('io: incomplete write to writer of MultiWriter')
 		}