server-esm: Change some more export object to export default object

src/services/import/enex.ts

@@ -409,4 +409,4 @@ function importEnex(taskContext: TaskContext, file: File, parentNote: BNote): Pr
     });
 }
 
-export = { importEnex };
+export default { importEnex };

src/services/import/mime.ts

@@ -110,7 +110,7 @@ function normalizeMimeType(mime: string) {
     return undefined;
 }
 
-export = {
+export default {
     getMime,
     getType,
     normalizeMimeType

src/services/import/single.ts

@@ -191,7 +191,7 @@ function importAttachment(taskContext: TaskContext, file: File, parentNote: BNot
     }
 }
 
-export = {
+export default {
     importSingleFile,
     importAttachment
 };