slapos-windows-installer: fix msexec abort buildout process

software/slapos-windows-installer/instance.cfg.in

@@ -11,11 +11,10 @@ recipe = slapos.recipe.cmmi
 # This url is useless
 path = $${buildout:directory}
 pre-configure =
-  echo "#! /bin/bash" > $${:configure-command}
-  echo "declare -r installer=${installer:location}/slapos-windows-all-in-one.exe" >> $${:configure-command}
-  echo "declare -r targetdir=\$(cygpath -w $${buildout:directory})" >> $${:configure-command}
-  echo "declare -r logfile=\$(cygpath -w $${buildout:directory}/slapos-windows-installer.log)" >> $${:configure-command}
-  echo "\$installer /DIR=\"\$targetdir\" /LOG=\"\$logfile\" /VERYSILENT" >> $${:configure-command}
+  declare -r installer=${installer:location}/slapos-windows-all-in-one.exe
+  declare -r targetdir=$(cygpath -w $${buildout:directory})
+  declare -r logfile=$(cygpath -w $${buildout:directory}/slapos-windows-installer.log)
+  echo "$installer /DIR=\"\$targetdir\" /LOG=\"\$logfile\" /VERYSILENT" > $${:configure-command}
   chmod +x $${:configure-command}
 configure-command = $${buildout:directory}/bootloader.sh
 pre-install =

software/slapos-windows-installer/software.cfg

@@ -60,7 +60,7 @@ post-install= ${:cygroot}/slapos-windows-wrapper.bat slapos-build-installer
 [instance-template]
 recipe = slapos.recipe.template
 url = ${:_profile_base_location_}/instance.cfg.in
-md5sum = 0878ed717321d474d0d2d7a264779d76
+md5sum = cc55040889f472f751f1aaa85e04e88f
 output = ${buildout:directory}/instance.cfg
 mode = 0644