use overseer's default strategy

[lceWolf]

No description provided.

[narodo]

I wasn't able to test this branch directly, I got this error:

Error executing Lua callback: ...are/nvim/lazy/cmake-tools.nvim/lua/cmake-tools/utils.lua:235: invalid value (table) at index 5 in table for 'concat'
stack traceback:
        [C]: in function 'concat'
        ...are/nvim/lazy/cmake-tools.nvim/lua/cmake-tools/utils.lua:235: in function <...are/nvim/lazy/cmake-tools.nvim/lua/cmake-tools/utils.lua:227>

However, manually cherry-picking this change onto latest master fixed the issue!
The overseer task now starts correctly even if no "jobstart" strategy is specified in the overseer options.

Tested with nvim version:
NVIM v0.11.5
Build type: Release
LuaJIT 2.1.1741730670

[lceWolf]

Thanks for testing :)