fetch disassembly show '\t' as 't'

**Describe the bug**
fetch disassembly show '\t' as 't'

**To Reproduce**
use riscv gdb, click fetch disassembly

**Screenshots**

**Please complete the following information:**
* OS: ubuntu run on windows wsl2
* gdbgui version (`gdbgui -v`): v0.15.0.1 and v0.15.1.0
* gdb version (`gdb -v`): 10.1 configured as "--host=x86_64-pc-linux-gnu --target=riscv64-unknown-elf"
* browser [e.g. chrome, safari]: Edge
* python packages (`pip freeze`):
> pip3 freeze
argcomplete==2.0.0
colorlog==6.7.0
distlib==0.3.6
filelock==3.8.0
nox==2022.8.7
packaging==21.3
platformdirs==2.5.2
py==1.11.0
pyparsing==3.0.9
virtualenv==20.16.6