Fixes bevyengine#134 and bevyengine#135 with a slight hit on performa…

…nces as get_or_assign_index will now always assign (bevyengine#247)

crates/bevy_render/src/render_graph/nodes/render_resources_node.rs

@@ -90,6 +90,8 @@ where
         for buffer_status in self.uniform_arrays.iter_mut() {
             if let Some((_name, buffer_status)) = buffer_status {
                 buffer_status.changed_item_count = 0;
+                buffer_status.current_index = 0;
+                buffer_status.indices.clear();
                 buffer_status.current_offset = 0;
                 buffer_status.changed_size = 0;
             }