fix: exclude php files from PWA assets

refs #445

ngsw-config.json

@@ -23,6 +23,7 @@
           "/MaterialIcons-Regular.1e50f5c2ffa6aba4.eot",
           "/assets/**",
           "!/**/*.pdf",
+          "!/**/*.php",
           "/*.(svg|cur|jpg|jpeg|png|apng|webp|avif|gif|otf|ttf|woff|woff2)"
         ]
       }