Revert "Handle HYDRA_EMAIL_TEMPLATES that are paths"

This doesn't work as planned, will re-work.

This reverts commit d2ce7747a0.

src/lib/Hydra/Plugin/EmailNotification.pm

@@ -12,7 +12,6 @@ use File::Slurp;
 use Template;
 use Hydra::Helper::Nix;
 use Hydra::Helper::CatalystUtils;
-use FileHandle;
 
 
 my $template = $ENV{'HYDRA_EMAIL_TEMPLATE'} || <<EOF;
@@ -93,19 +92,9 @@ sub buildFinished {
             };
 
         my $body;
-        if (-e $template) {
-            my $fh = FileHandle->new($template, "r");
-            if ($fh) {
-                $template = $fh;
-            }
-        }
         $tt->process(\$template, $vars, \$body)
             or die "failed to generate email from template";
 
-        if (ref($template) eq "FileHandle") {
-            $template->close();
-        }
-
         # stripping trailing spaces from lines
         $body =~ s/[\ ]+$//gm;