Runtime fields: fix a test name (#62498)

This fixes the name of a test method so we actually run it. I broke it a
few commits ago without realizing it.

x-pack/plugin/runtime-fields/src/test/java/org/elasticsearch/xpack/runtimefields/mapper/BooleanScriptMappedFieldTypeTests.java

@@ -341,7 +341,7 @@ public class BooleanScriptMappedFieldTypeTests extends AbstractNonTextScriptMapp
         }
     }
 
-    public void randomTermsQueryDegeneratesIntoMatchNone() throws IOException {
+    public void testEmptyTermsQueryDegeneratesIntoMatchNone() throws IOException {
         assertThat(
             simpleMappedFieldType().termsQuery(org.elasticsearch.common.collect.List.of(), mockContext()),
             instanceOf(MatchNoDocsQuery.class)