Remove dead code referencing deleted "suites" attribute.

This used to be how test_suites depended on other test_suites.
Now they just go in "tests".

--
PiperOrigin-RevId: 142607603
MOS_MIGRATED_REVID=142607603
diff --git a/src/main/java/com/google/devtools/build/lib/packages/Package.java b/src/main/java/com/google/devtools/build/lib/packages/Package.java
index 7e1fca4..dc84c5d 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/Package.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/Package.java
@@ -1311,9 +1311,7 @@
       for (Rule rule : rules) {
         AttributeMap attributes = NonconfigurableAttributeMapper.of(rule);
         if (rule.getRuleClass().equals("test_suite")
-            && attributes.get("tests", BuildType.LABEL_LIST).isEmpty()
-            && (!attributes.has("suites", BuildType.LABEL_LIST)
-                || attributes.get("suites", BuildType.LABEL_LIST).isEmpty())) {
+            && attributes.get("tests", BuildType.LABEL_LIST).isEmpty()) {
           rule.setAttributeValueByName("$implicit_tests", allTests);
         }
       }