Set experimental_unused_deps default value to off

Author: JonathanPerry651

src/main/java/com/google/devtools/build/lib/rules/java/JavaOptions.java

@@ -186,7 +186,7 @@ public OneVersionEnforcementLevelConverter() {
   @Option(
       name = "experimental_unused_deps",
       allowMultiple = false,
-      defaultValue = "default",
+      defaultValue = "off",
       converter = StrictDepsConverter.class,
       documentationCategory = OptionDocumentationCategory.INPUT_STRICTNESS,
       effectTags = {OptionEffectTag.BUILD_FILE_SEMANTICS, OptionEffectTag.EAGERNESS_TO_EXIT},

src/test/java/com/google/devtools/build/lib/rules/java/JavaStarlarkApiTest.java

@@ -186,7 +186,7 @@ def _impl(ctx):
             configuredTarget.get(
                 new StarlarkProvider.Key(
                     keyForBuild(Label.parseCanonical("//foo:rule.bzl")), "result"));
-    assertThat(((String) info.getValue("unused_deps"))).isEqualTo("default");
+    assertThat(((String) info.getValue("unused_deps"))).isEqualTo("off");
   }
 
   @Test