ADFA-4927: Remove stale stat-uploader proguard rule (#1612)

The com.itsaky.androidide.stats package (idestats module, WorkManager
uploader, tests, manifest/gradle entries) was already fully deleted in
95f4acd (ADFA-664). Only this now-meaningless -keep rule was left
behind, referencing a package that no longer exists in the codebase.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

Author: davidschachterADFA

app/proguard-rules.pro

@@ -157,9 +157,6 @@
 -keep interface okhttp3.** { *; }
 -dontwarn okhttp3.**
 
-# Stat uploader
--keep class com.itsaky.androidide.stats.** { *; }
-
 # Gson
 -keep class * extends com.google.gson.TypeAdapter
 -keep class * implements com.google.gson.TypeAdapterFactory