[lldb] Re-enable TestExprsChar on arm64

This test passes on arm64 (Apple Silicon). I assume that "aarch64" still
ensures this gets skipped on Linux. I don't have access to such and
environment so I'll have to rely on the bot complaining.

GitOrigin-RevId: 28c6b1e5522f2beeac48ccf359e423cb31160c8d
diff --git a/test/API/commands/expression/char/TestExprsChar.py b/test/API/commands/expression/char/TestExprsChar.py
index a1a4568..e2229a0 100644
--- a/test/API/commands/expression/char/TestExprsChar.py
+++ b/test/API/commands/expression/char/TestExprsChar.py
@@ -22,7 +22,6 @@
 
     @expectedFailureAll(
         archs=[
-            "arm",
             "aarch64",
             "powerpc64le",
             "s390x"],