WIP: fix(core): use BufferMapState::Active for any BufferUsages::MAP_* flags

TODO: explain why this works, also trepidation at how simple this was.
TODO: test test test

Author: ErichDonGubler

wgpu-core/src/device/resource.rs

@@ -990,7 +990,10 @@ impl Device {
 
         let buffer_use = if !desc.mapped_at_creation {
             wgt::BufferUses::empty()
-        } else if desc.usage.contains(wgt::BufferUsages::MAP_WRITE) {
+        } else if desc
+            .usage
+            .intersects(wgt::BufferUsages::MAP_WRITE | wgt::BufferUsages::MAP_READ)
+        {
             // buffer is mappable, so we are just doing that at start
             let map_size = buffer.size;
             let mapping = if map_size == 0 {