fix(nsis): verbose flag on unix systems

.changes/fix-nsis-on-unix.md

@@ -0,0 +1,5 @@
+---
+"cargo-packager": patch
+---
+
+Fix bundling NSIS on Linux and macOS failing due to the verbose flag.

crates/packager/src/package/nsis/mod.rs

@@ -538,10 +538,10 @@ fn build_nsis_app_installer(ctx: &Context, nsis_path: &Path) -> crate::Result<Ve
 
     if let Some(level) = config.log_level {
         nsis_cmd.arg(match level {
-            LogLevel::Error => "/V1",
-            LogLevel::Warn | LogLevel::Info => "/V2",
-            LogLevel::Debug => "/V3",
-            _ => "/V4",
+            LogLevel::Error => "-V1",
+            LogLevel::Warn | LogLevel::Info => "-V2",
+            LogLevel::Debug => "-V3",
+            _ => "-V4",
         });
     }