Renaming compose slider haptics flag.

Following go/trunk-stable-bug-fix#switching, renaming and changing the purpose of this flag, which was incorrectly created as a feature flag.

Test: presubmit
Flag: NONE renaming flag
Bug: 341968766

Change-Id: If860c7fcc4102cadbb77a69d6b2942e6402520ff
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 6c3ba68..aaa527d 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -1401,10 +1401,13 @@
 }
 
 flag {
-   name: "compose_haptic_sliders"
+   name: "haptics_for_compose_sliders"
    namespace: "systemui"
    description: "Adding haptic component infrastructure to sliders in Compose."
    bug: "341968766"
+   metadata {
+        purpose: PURPOSE_BUGFIX
+   }
 }
 
 flag {