Windows setup: fix copyright

Signed-off-by: Nicola Murino <[email protected]>

windows-installer/sftpgo.iss

@@ -33,7 +33,7 @@ AppPublisher=Nicola Murino
 AppPublisherURL={#MyAppURL}
 AppSupportURL={#MyAppURL}
 AppUpdatesURL={#MyAppURL}
-AppCopyright=AGPL-3.0
+AppCopyright=2019-2025 Nicola Murino
 DefaultDirName={autopf}\{#MyAppName}
 DefaultGroupName={#MyAppName}
 LicenseFile=LICENSE_with_NOTICE.txt