Update ChewingTextService.cpp

Now we can save our string to dictionary.txt(C:/Users/usernmae/dictionary.txt) line 1~line 9 (line 0 can't be uesd)and output our string on uncomposition mode.

We will read string from dictoinary.txt  when pressing  first button.
Add changed buffer to dictoinary.txt on composition-mode and 
reload ctrl buffer after pressing button next time.

However, we find another problem that '`' will be triggered when press ctrl+1 or ctrl+0 on composition mode.
I don't know how to fix because this behavior has existed before previous version