Fix incorrect method leading to silent exceptions in signal handlers

[BioTurboNick]

Resolves #593

[codecov]

Codecov Report

Merging #595 (93e42de) into master (0ff7447) will increase coverage by 0.50%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #595      +/-   ##
==========================================
+ Coverage   48.10%   48.60%   +0.50%     
==========================================
  Files          32       32              
  Lines        2580     2660      +80     
==========================================
+ Hits         1241     1293      +52     
- Misses       1339     1367      +28     

Impacted Files	Coverage Δ
src/GLib/signals.jl	75.72% <0.00%> (-0.23%)	⬇️
src/text.jl	39.44% <0.00%> (-0.19%)	⬇️
src/Gtk.jl	85.18% <0.00%> (-3.28%)	⬇️
src/events.jl	43.87% <0.00%> (-2.36%)	⬇️
src/container.jl	46.51% <0.00%> (-0.99%)	⬇️
src/windows.jl	22.22% <0.00%> (-0.73%)	⬇️
src/displays.jl	13.04% <0.00%> (-0.44%)	⬇️
src/precompile.jl	0.00% <0.00%> (ø)
... and 11 more

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[tknopp]

thanks!