[tex-k] another spacing typo in MFbook

[胡亚捷 (Hu Yajie)]

Page C22, line 10: Change
    draw z1; draw z2;  draw z3;  draw z4;  draw z5;  draw z6.
to
    draw z1;  draw z2;  draw z3;  draw z4;  draw z5;  draw z6.

In other words, change mfbook.tex, line 1435
@draw@ $z_1$;\ @draw@ $z_2$; \ @draw@ $z_3$; \ @draw@ $z_4$;
to
@draw@ $z_1$; \ @draw@ $z_2$; \ @draw@ $z_3$; \ @draw@ $z_4$;

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Previous reports:
https://github.com/dine2014/texbook-mfbook-bugs/blob/master/bugs.md