Fix tailwind config error

Author: samejr

apps/webapp/tailwind.config.js

@@ -161,7 +161,7 @@ const schedules = colors.yellow[500];
 const queues = colors.purple[500];
 const query = colors.blue[500];
 const metrics = colors.green[500];
-const customDashboards = colors.charcoal[600];
+const customDashboards = charcoal[200];
 const deployments = colors.green[500];
 const concurrency = colors.amber[500];
 const limits = colors.purple[500];