fix: use lowercased key when validating windowsterminal.profileTemplate

[Osamaali313]

Problem

read_config_keys lowercases option names when building its key dict:

keys[f'{section}.{key.lower()}'] = config[section][key]   # line 198

So a [windowsterminal] section with profileTemplate = ... is stored under windowsterminal.profiletemplate. But the validation block looks it up with the camelCase key:

if terminal_profile := config.get('windowsterminal.profileTemplate', None):   # line 455
    validate_mode(terminal_profile, [oct(0o660), oct(0o640)], 0, 0, 1024 * 1024)
    if not terminal_profile.startswith(USR_LIB_WSL):
        warning(...)

dict.get is case-sensitive, so this always returns None and the block never runs — the terminal profile template file's mode/size/location checks are silently skipped for every distribution validated. The valid-keys list (line 433) and every other config.get(...) in this function already use the lowercase form (oobe.command, shortcut.icon, windowsterminal.profiletemplate, …); line 455 was the lone outlier.

Reproduction

Using the real read_config_keys on the canonical config ([windowsterminal] / profileTemplate = /usr/lib/wsl/terminal.json, as written in the repo's own tests):

stored keys: ['windowsterminal.profiletemplate']
get('windowsterminal.profileTemplate') -> None   # block SKIPPED (bug)
get('windowsterminal.profiletemplate') -> '/usr/lib/wsl/terminal.json'   # block RUNS (fixed)

Fix

Look up the lowercase key at line 455 so the validation block executes. One-character change; behavior of all other keys is unchanged.

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