Disable the post-install option to launch Pinta, when in silent mode

This is required for the Chocolatey package (see https://groups.google.com/g/pinta-project/c/1l-mCx5bt8E/m/SDcN-spXBgAJ)

CHANGELOG.md

@@ -17,6 +17,7 @@ Thanks to the following contributors who worked on this release:
 - Fixed errors that could occur if a selection existed but had zero area (e.g. after inverting a full selection) ([#1754440](https://bugs.launchpad.net/pinta/+bug/1754440))
 - Hidden layers are now round-tripped correctly for `.ora` files ([#1377566](https://bugs.launchpad.net/pinta/+bug/1377566))
 - When saving a `.ora` file, a flattened image (`mergedimage.png`) is now included in the archive. This is required by the spec to accomodate viewer software ([#1377566](https://bugs.launchpad.net/pinta/+bug/1377566))
+- When the Windows installer is run in silent mode, the option to launch Pinta after installing is now disabled
 
 ## [2.0.1](https://github.com/PintaProject/Pinta/releases/tag/2.0.1) - 2022/01/06
 

installer/windows/installer.iss

@@ -32,4 +32,4 @@ Source: "bin\win-x64\publish\*"; DestDir: "{app}"; Flags: ignoreversion recurses
 Source: "{#GetEnv('LOCALAPPDATA')}\Gtk\3.24.24\*"; Excludes: "gtk.zip,*mm-*.dll"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs
 
 [Run]
-Filename: "{app}\Pinta.exe"; Flags: nowait postinstall; Description: "{cm:LaunchProgram,{#ProductName}}"
+Filename: "{app}\Pinta.exe"; Flags: nowait postinstall skipifsilent; Description: "{cm:LaunchProgram,{#ProductName}}"