fix(export): remove prefix spaces when no-indent

[RCmerci]

when export with "no-indent" style
export:

- 1
  2
  - 3
    4

result:

1
2
3
4

before-fix:

1
  2  
3
	  4

[andelf]

My experimental:

- asdfjasd
  yes  
  but  
	- aslkdfja
	  ```c
	  #include <iosteam>
	  
	  void mian() {
	    return;
	  }
	  ```
	- asldkjf
		- asldkfj
asldkjf
asldkfj

The code block is still buggy.

[RCmerci]

@andelf updated
export:

asdfjasd
yes
but
aslkdfja
```c
#include <iosteam>

void mian() {
  return;
}
```
asldkjf
asldkfj
asldkjf
asldkfj

[andelf]

Verified. LGTM.

[dmytrodubinin]

Tested in latest 0.10.4-alpha+nightly.20240117, my bug is still relevant: #10848

[RCmerci]

@andelf @dmytrodubinin another fix here #10866