Revert "[roheap] Enable shared ro-heap by default if ptr compression is disabled"

This reverts commit 81abe8f7.

Reason for revert: Fails several bots, e.g. https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN/26780

Original change's description:
> [roheap] Enable shared ro-heap by default if ptr compression is disabled
> 
> Shared read-only heap is currently incompatible with pointer compression.
> Enable sharing only if pointer compression is disabled.
> 
> Bug: v8:7464
> Change-Id: I0866ac288a34eb92fc227e8beba57f4d72a69ef0
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1635509
> Reviewed-by: Dan Elphick <delphick@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Commit-Queue: Maciej Goszczycki <goszczycki@google.com>
> Cr-Commit-Position: refs/heads/master@{#61963}

TBR=rmcilroy@chromium.org,delphick@chromium.org,goszczycki@google.com

Change-Id: If450c8a7530763e69eaddb53583f890a467f4724
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7464
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1640216Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61964}

BUILD.gn

@@ -225,7 +225,7 @@ if (v8_enable_snapshot_native_code_counters == "") {
   v8_enable_snapshot_native_code_counters = v8_enable_debugging_features
 }
 if (v8_enable_shared_ro_heap == "") {
-  v8_enable_shared_ro_heap = !v8_enable_pointer_compression
+  v8_enable_shared_ro_heap = v8_enable_lite_mode
 }
 if (v8_enable_fast_torque == "") {
   v8_enable_fast_torque = v8_enable_fast_mksnapshot