Failed title revert after render

[enp2s0]

After rendering a song, the main window title fails to revert to its normal title and remains as "Rendering: 100%".

Reproduce
open a song
render it
look at main window title, even after the render is complete it stays as "Rendering: 100%"

This is probably a simple fix...

[zonkmachine]

The function that resets the window title is MainWindow::resetWindowTitle().
I could replicate this with the Qt5 AppImage but not on compiling the Qt4 version.

This is probably a simple fix...

I dare you...

[enp2s0]

A one-line change was all that was needed, I've created a pull request with the change. Should I close this issue?

PR: #4161

[tresf]

@noahb01 thanks for taking the time to document and fix this! This is really a good candidate for stable-1.2. This would throw your master branch out of whack and that's overkill for a one-liner, I'll take it from here.