'Filename from Tag' inserts one extra space at the start of the file name

Description

When you set the file name using the 'From Tag' buttons (I only tested it with 'Tag 2') an extra space will be inserted at the beginning of the file name.

Reproduce

1. Open Kid3
2. Select an audio file
3. Create a tag if it does not exist
4. Enter a title "Example"
5. Press the 'From: Tag 2' button
6. Title will be " Example"

Version info

• Linux elias-arch-gaming 5.9.6-arch1-1 #1 SMP PREEMPT Thu, 05 Nov 2020 21:00:46 +0000 x86_64 GNU/Linux
• Kid3 3.8.4