style: format code with gofumpt (#383)

Format code with gofumpt

This commit fixes the style issues introduced in 12e48d1 according to the output
from gofumpt.

Details: https://app.deepsource.com/gh/divideprojects/Alita_Robot/transform/beda40eb-0cc1-4834-b4fc-cc924025f3a1/

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

alita/modules/bot_updates.go

@@ -57,9 +57,7 @@ func botJoinedGroup(b *gotgbot.Bot, ctx *ext.Context) error {
 		return ext.EndGroups
 	}
 
-	var (
-		msgAdmin = "\n\nMake me admin to use me with my full abilities!"
-	)
+	msgAdmin := "\n\nMake me admin to use me with my full abilities!"
 
 	// used to check if bot was added as admin or not
 	if chat_status.IsBotAdmin(b, ctx, nil) {