Fix too small height of the carla instrument window

[PhysSong]

Fixes #5828.

[LmmsBot]

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Linux

• Linux (AppImage): lmms-1.2.3-792%2Bg266d914-linux-x86_64.AppImage (build link)

Windows

• Windows 32-bit: lmms-1.2.3-792%2Bg266d91409-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.2.3-792%2Bg266d91409-mingw-win64.exe (build link)
• Windows 32-bit: lmms-1.3.0-alpha-msvc2017-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha-msvc2017-win64.exe (build link)

macOS

• macOS : lmms-1.2.3-792%2Bg266d91409-mac10.14.dmg (build link)

🤖

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[zonkmachine]

It also affects the behavior of #5827 so they seem related after all.

[PhysSong]

It also affects the behavior of #5827

How?

[zonkmachine]

How?

You can now easily grab/drag the plugin, so that's a fix. The cursor behavior has changed a bit though. For instance, earlier you had the hand when you were over the canvas and now it's the arrow. That sounds about right. In the FX Mixer you used to have the hand over the "Add channel" button and now it's the arrow. In the Song Editor you now create a track content objects with the arrow and it used to be the hand cursor. Now when the tco exists it's once more the hand cursor when you move over it. Things like that.

Edit: See post below.

[zonkmachine]

OK. I get it now. I saw changes in the rest of lmms but this is because once you open one of the Carla instruments, they won't give you back the arrow. It looks like this persists for the rest of the session.

Merge?