addStretch() before adding the oscilloscope

[husamalhomsi]

Before:

After:

I think it looks better.

[LmmsBot]

🤖 Hey, I'm @LmmsBot from github.com/lmms/bot and I made downloads for this pull request, click me to make them magically appear! 🎩

Linux

• Linux (AppImage): lmms-1.2.1.661-linux-x86_64.AppImage (build link)

Windows

• Windows 32-bit: lmms-1.2.1.661-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.2.1.661-mingw-win64.exe (build link)
• Windows 32-bit: lmms-1.2.1-msvc2017-win32.exe (build link)
• Windows 64-bit: lmms-1.2.1-msvc2017-win64.exe (build link)

macOS

• macOS : lmms-1.2.1.661-mac10.13.dmg (build link)

🤖

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[JohannesLorenz]

Nice. Code and style review passed. Merging.