When printing a file one line at a time, don't use putmsg()
Fix problem introduced in b1ecd9b6 (August 8, 2019) When sbbs_t::printfile() is used to display a file that is < 2MB in size and the P_OPENCLOSE mode flag was not specified, the file is read and displayed one line at a time. This allows for the quick display of very large files. This was accomlished by calling sbbs_t::putmsg() for each line. Unfortunately, putmsg() would save and restore console mode flags like the auto-screen pause control flags stored in sbbs_t::sys_misc so this would render some features like the POFF @-code, inoperable. This problem was reported by WitNik with files displayed from Bulleeye! Bulletins. Other issues were discovered with the WORDWRAP/WRAPOFF @-codes. Fixed with the addition of sbbs_t::putmsgfrag() which is used by printfile() to display a message fragment (one line) without saving/restoring console state flags.