fix (VFS): changing nodes size on write

kernel/src/drivers/fs/vfs.c

@@ -229,6 +229,9 @@ void vfs_file_delete(vfs_node_T* file) {
 }
 
 void vfs_file_write(vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_in) {
+    // in future this probably isn't a good way to determine the size of a file:
+    file->size = size;
+
     switch (file->filesystem->type) {
         case FS_RAMFS: {
             ramfs_file_write(file, size, buffer_in);