bcachefs: Align the display format of `btrees/inodes/keys`

Before patch:
```
 #cat btrees/inodes/keys
 u64s 17 type inode_v3 0:4096:U32_MAX len 0 ver 0:   mode=40755
   flags= (16300000)
   bi_size=0
```

After patch:
```
 #cat btrees/inodes/keys
 u64s 17 type inode_v3 0:4096:U32_MAX len 0 ver 0:
   mode=40755
   flags=(16300000)
   bi_size=0
```
Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/inode.c

@@ -534,12 +534,13 @@ int bch2_inode_v3_invalid(struct bch_fs *c, struct bkey_s_c k,
 static void __bch2_inode_unpacked_to_text(struct printbuf *out,
 					  struct bch_inode_unpacked *inode)
 {
+	prt_printf(out, "\n");
 	printbuf_indent_add(out, 2);
 	prt_printf(out, "mode=%o\n", inode->bi_mode);
 
 	prt_str(out, "flags=");
 	prt_bitflags(out, bch2_inode_flag_strs, inode->bi_flags & ((1U << 20) - 1));
-	prt_printf(out, " (%x)\n", inode->bi_flags);
+	prt_printf(out, "(%x)\n", inode->bi_flags);
 
 	prt_printf(out, "journal_seq=%llu\n",	inode->bi_journal_seq);
 	prt_printf(out, "bi_size=%llu\n",	inode->bi_size);