test: update tick processor's function label

Match the JS: prefix that V8 has emitted for JavaScript functions since
6bd756d. The LazyCompile expectation caused the test to time out when
profiling succeeded without UNKNOWN samples.

Assisted-by: Codex
Signed-off-by: Tamir Duberstein <tamird@gmail.com>

Author: tamird

test/tick-processor/test-tick-processor-unknown.js

@@ -14,7 +14,7 @@ const base = require('./tick-processor-base.js');
 // Unknown checked for to prevent flakiness, if pattern is not found,
 // then a large number of unknown ticks should be present
 base.runTest({
-  pattern: /LazyCompile.*\[eval]:1|.*% {2}UNKNOWN/,
+  pattern: /JS:.*\[eval]:1|.*% {2}UNKNOWN/,
   code: `function f() {
            for (let i = 0; i < 1000000; i++) {
              i++;