Update the memory trim level on memory pressure events

If the USE_MODERN_TRIM is enabled, we had skipped the updates
of the memory trim level, which is useful to the job scheduler.

Now fix this problem by moving the update ahead.

Bug: 300277099
Change-Id: I190e9598ee72efcb466548bab0210d51d7648cd5
Test: adb shell am memory-factor show