Fix bug where it deletes the entire user PATH

Author: benja2998

installer/installer.nsi

@@ -12,20 +12,18 @@ Section "Install"
   SetOutPath "$INSTDIR"
   File "..\build\Debug\opencmd.exe"
 
-  ReadRegStr $0 HKCU "Environment" "Path"
-  StrCpy $1 $INSTDIR
+ReadRegStr $0 HKCU "Environment" "Path"
+StrCpy $1 "$INSTDIR"
 
   ${If} $0 != ""
     ${StrStr} $2 $0 $1
     ${If} $2 == ""
-      StrCpy $0 "$0;$INSTDIR"
-      WriteRegStr HKCU "Environment" "Path" "$0"
-      ; Broadcast the environment change
-      System::Call 'User32::SendMessageTimeout(i 0xffff, i ${WM_SETTINGCHANGE}, i 0, t "Environment", i 0x0002, i 5000, *i .r0)'
+      StrCpy $0 "$0;$1"
     ${EndIf}
   ${Else}
-    WriteRegStr HKCU "Environment" "Path" "$INSTDIR"
-    System::Call 'User32::SendMessageTimeout(i 0xffff, i ${WM_SETTINGCHANGE}, i 0, t "Environment", i 0x0002, i 5000, *i .r0)'
+    StrCpy $0 "$1"
   ${EndIf}
+
+  System::Call 'User32::SendMessageTimeout(i 0xffff, i ${WM_SETTINGCHANGE}, i 0, t "Environment", i 0x0002, i 5000, *i .r0)'
   MessageBox MB_OK "Installation complete. Please restart any running programs for PATH changes to apply."
 SectionEnd