fix(nsis): set correct ShellVarContext for uninstaller, closes #7315 (#7342)

Author: amrbashir

.changes/nsis-start-menu-shortcut.md

@@ -0,0 +1,5 @@
+---
+'tauri-bundler': 'patch:bug'
+---
+
+On Windows, fix NSIS uninstaller failing to remove Start Menu shortcut if `perMachine` mode is used.

tooling/bundler/src/bundle/windows/templates/installer.nsi

@@ -344,16 +344,7 @@ FunctionEnd
   !include "{{this}}"
 {{/each}}
 
-Var PassiveMode
-Function .onInit
-  ${GetOptions} $CMDLINE "/P" $PassiveMode
-  IfErrors +2 0
-    StrCpy $PassiveMode 1
-
-  !if "${DISPLAYLANGUAGESELECTOR}" == "true"
-    !insertmacro MUI_LANGDLL_DISPLAY
-  !endif
-
+!macro SetContext
   !if "${INSTALLMODE}" == "currentUser"
     SetShellVarContext current
   !else if "${INSTALLMODE}" == "perMachine"
@@ -369,6 +360,19 @@ Function .onInit
       SetRegView 32
     !endif
   ${EndIf}
+!macroend
+
+Var PassiveMode
+Function .onInit
+  ${GetOptions} $CMDLINE "/P" $PassiveMode
+  IfErrors +2 0
+    StrCpy $PassiveMode 1
+
+  !if "${DISPLAYLANGUAGESELECTOR}" == "true"
+    !insertmacro MUI_LANGDLL_DISPLAY
+  !endif
+
+  !insertmacro SetContext
 
   ${If} $INSTDIR == ""
     ; Set default install location
@@ -595,15 +599,7 @@ Function .onInstSuccess
 FunctionEnd
 
 Function un.onInit
-  ${If} ${RunningX64}
-    !if "${ARCH}" == "x64"
-      SetRegView 64
-    !else if "${ARCH}" == "arm64"
-      SetRegView 64
-    !else
-      SetRegView 32
-    !endif
-  ${EndIf}
+  !insertmacro SetContext
 
   !if "${INSTALLMODE}" == "both"
     !insertmacro MULTIUSER_UNINIT