only include devIndicators if it's False (#5066)

* only include devIndicators if it's False

* fix the tests

reflex/utils/prerequisites.py

@@ -1091,8 +1091,10 @@ def _update_next_config(
         "compress": config.next_compression,
         "trailingSlash": True,
         "staticPageGenerationTimeout": config.static_page_generation_timeout,
-        "devIndicators": config.next_dev_indicators,
     }
+    if not config.next_dev_indicators:
+        next_config["devIndicators"] = False
+
     if transpile_packages:
         next_config["transpilePackages"] = list(
             {format_library_name(p) for p in transpile_packages}

tests/units/test_prerequisites.py

@@ -77,7 +77,7 @@ runner = CliRunner()
                 next_dev_indicators=True,
             ),
             True,
-            'module.exports = {basePath: "", compress: true, trailingSlash: true, staticPageGenerationTimeout: 60, devIndicators: true, output: "export", distDir: "_static"};',
+            'module.exports = {basePath: "", compress: true, trailingSlash: true, staticPageGenerationTimeout: 60, output: "export", distDir: "_static"};',
         ),
     ],
 )