Fix display size update check.

Before the change, if either width or height differs, but not both,
the display size update would not happen.

Fix: change the if condition to "or" instead of "and".

Test: manual display resolution changes
Test: atest LogicalDisplayTest DisplayDeviceTest 
Bug: 355427258 
Flag: com.android.graphics.surfaceflinger.flags.synced_resolution_switch
Change-Id: I44bb3c73112dd729ad3686936f6443b229090596