Update DBAppender.cfc

Use the left function around the category value for the insert statement on line 145 (similar to the appendername on line 147).  The category length is 100 in the database but depending on what is passed in for category, there is a potential to be longer than 100 and cause an insert error.
Merge pull request #193 from garciadev/patch-1

LOGBOX-14 #resolve #close
Truncating of category data to avoid error on insertion on DB Appender