fix: update option handling

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---

Author: kgryte

lib/node_modules/@stdlib/plot/base/server/lib/main.js

@@ -77,11 +77,9 @@ function createServer( router, clbk ) {
 	// Extract server options:
 	sopts = serverOpts( {} );
 
-	// Set require server options for SSL:
-	sopts = {
-		'cert': readFileSync( resolve( KEYS_DIR, 'localhost_cert.pem' ) ),
-		'key': readFileSync( resolve( KEYS_DIR, 'localhost_privkey.pem' ) )
-	};
+	// Set required server options for SSL:
+	sopts.cert = readFileSync( resolve( KEYS_DIR, 'localhost_cert.pem' ) );
+	sopts.key = readFileSync( resolve( KEYS_DIR, 'localhost_privkey.pem' ) );
 
 	// Create a function to boot a server...
 	boot = serverFactory( sopts, requestListener );