CI/Windows: install_omt: drop {}

Author: mpiatka

.github/scripts/Windows/prepare_msys.sh

@@ -100,7 +100,7 @@ https://github.com/CESNET/GPUJPEG/releases/download/continuous/"$fname"
         cp -r GPUJPEG/* /usr/local/
 )
 
-install_omt() {(
+install_omt() (
         omt_ver="v1.0.0.14"
         fname=OpenMediaTransport.Binaries.Release."$omt_ver".zip
         wget --no-verbose \
@@ -110,7 +110,7 @@ install_omt() {(
         cp Libraries/Winx64/*dll /usr/local/bin/
         cp Libraries/Winx64/*dll /usr/local/lib/
         cp Libraries/Winx64/*.h /usr/local/include/
-)}
+)
 
 # Install cross-platform deps
 "$GITHUB_WORKSPACE/.github/scripts/install-common-deps.sh"