tools: specify rules disabled in common/dns.js

Instead of disabling all ESLint rules for a line, specify the two rules
that should be disabled.

PR-URL: #22563
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/common/dns.js

@@ -39,7 +39,7 @@ function readDomainFromPacket(buffer, offset) {
   } else {
     // Pointer to another part of the packet.
     assert.strictEqual(length & 0xC0, 0xC0);
-    // eslint-disable-next-line
+    // eslint-disable-next-line space-infix-ops, space-unary-ops
     const pointeeOffset = buffer.readUInt16BE(offset) &~ 0xC000;
     return {
       nread: 2,