Remove some unused variables in TAP tests

Author: Amul Sul
Discussion: https://postgr.es/m/CAAJ_b96xuFh4JZE6p-zhLyDu7q=NbxJfb1z_yeAu6t-MqaBC+Q@mail.gmail.com

src/bin/pg_ctl/t/002_status.pl

@@ -9,7 +9,6 @@ use TestLib;
 use Test::More tests => 3;
 
 my $tempdir       = TestLib::tempdir;
-my $tempdir_short = TestLib::tempdir_short;
 
 command_exit_is([ 'pg_ctl', 'status', '-D', "$tempdir/nonexistent" ],
 	4, 'pg_ctl status with nonexistent directory');

src/bin/pg_dump/t/001_basic.pl

@@ -10,7 +10,6 @@ use TestLib;
 use Test::More tests => 82;
 
 my $tempdir       = TestLib::tempdir;
-my $tempdir_short = TestLib::tempdir_short;
 
 #########################################
 # Basic checks

src/bin/pg_dump/t/002_pg_dump.pl

@@ -10,7 +10,6 @@ use TestLib;
 use Test::More;
 
 my $tempdir       = TestLib::tempdir;
-my $tempdir_short = TestLib::tempdir_short;
 
 ###############################################################
 # Definition of the pg_dump runs to make.

src/bin/pg_dump/t/003_pg_dump_with_server.pl

@@ -9,7 +9,6 @@ use TestLib;
 use Test::More tests => 3;
 
 my $tempdir       = TestLib::tempdir;
-my $tempdir_short = TestLib::tempdir_short;
 
 my $node = PostgresNode->new('main');
 my $port = $node->port;

src/test/modules/test_pg_dump/t/001_base.pl

@@ -10,7 +10,6 @@ use TestLib;
 use Test::More;
 
 my $tempdir       = TestLib::tempdir;
-my $tempdir_short = TestLib::tempdir_short;
 
 ###############################################################
 # This structure is based off of the src/bin/pg_dump/t test