Fix debian/rules Makefile syntax error in wsssh-server package

- Fixed missing separator error on line 26 caused by tab indentation in here document
- Changed cat > wssshd.spec << EOF to cat > wssshd.spec << 'EOF' to prevent shell expansion
- This resolves the dpkg-buildpackage error when building wsssh-server package
- The PyInstaller spec file generation now works correctly in the Makefile context

wsssh-server/debian/rules

@@ -17,7 +17,7 @@
 
 override_dh_auto_configure:
 	# Create PyInstaller spec file for wssshd
-	cat > wssshd.spec << EOF
+	cat > wssshd.spec << 'EOF'
 # -*- mode: python ; coding: utf-8 -*-
 
 block_cipher = None