reference global logrus (#274)

* reference logrus' global logger instead of passing and storing a logger reference everywhere

* always directly use global logrus logger instead of referencing an instance

* test suites should also directly use the global logrus logger

* rename gin logging function to clarify that it's middleware

* correct comments which erroneously referenced removed logger parameter

* setting log level for tests now uses logrus' exported type instead of the string value, to guarantee error isn't possible

internal/trans/exporter.go

@@ -21,7 +21,6 @@ package trans
 import (
 	"context"
 
-	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 )
 
@@ -32,15 +31,13 @@ type Exporter interface {
 
 type exporter struct {
 	db         db.DB
-	log        *logrus.Logger
 	writtenIDs map[string]bool
 }
 
-// NewExporter returns a new Exporter that will use the given db and logger.
-func NewExporter(db db.DB, log *logrus.Logger) Exporter {
+// NewExporter returns a new Exporter that will use the given db.
+func NewExporter(db db.DB) Exporter {
 	return &exporter{
 		db:         db,
-		log:        log,
 		writtenIDs: make(map[string]bool),
 	}
 }