addbib: correctly re-open database

[mknos]

• I discovered the cause of the close() error I was seeing when editing a database entry with vi, then hitting y to continue
• When continuing a new entry is expected to be appended to the database
• The file was closed and re-opened between executing vi; however, due to the "my" declaration in the open() call an alias of the global filehandle $DATABASE was made
• Make sure there is only one $DATABASE variable; now I can correctly append new entries after editing an entry with vi

%perl addbib 123c
Instructions? (n) n
Author name: 123
Title: 123
Journal: 123
Volume: 123
Pages: 123
Publisher: 123
City: 123
Date: 123
Other: 123
Keywords: 123
Abstract: 123
Continue? (y) vi
Continue? (y) y
Author name: this 
Title: 234
Journal: 234
Volume: 234
Pages: 234
Publisher: 234
City: 234
Date: 234
Other: 234
Keywords: 234
Abstract: 23444
Continue? (y) n
%cat 123c # empty line1 had been deleted from 1st database entry with vi
%A	123
%T	123
%J	123
%V	123
%P	123
%I	123
%C	123
%D	123
%O	123
%K	123
%X	123

%A	this
%T	234
%J	234
%V	234
%P	234
%I	234
%C	234
%D	234
%O	234
%K	234
%X	23444

[coveralls]

Pull Request Test Coverage Report for Build 10765406861

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 73.069%

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Totals
Change from base Build 10765147047:	-0.7%
Covered Lines:	350
Relevant Lines:	479

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💛 - Coveralls

[briandfoy]

changes: fix database re-opening that was masking a lexical variable