Fix: Disable tput and stty Check on Windows

[Losses]

Summary

This PR addresses an issue where the tput and stty command check is performed on Windows systems. Since tput and stty is not available on Windows, this check should be bypassed to prevent errors like this:

lib\sam\src\sam\shell_table.cr:32 in 'has_tput?'
lib\sam\src\sam\shell_table.cr:22 in 'terminal_width'
lib\sam\src\sam\shell_table.cr:11 in 'initialize'
lib\sam\src\sam\shell_table.cr:10 in 'new'
lib\sam\src\sam\tasks.cr:6 in '->'
lib\sam\src\sam\task.cr:56 in 'call'
lib\sam\src\sam\execution.cr:19 in 'invoke'
lib\sam\src\sam.cr:38 in 'invoke'
lib\sam\src\sam.cr:57 in 'process_tasks'
lib\sam\src\sam.cr:42 in 'help'
sam.cr:5 in '__crystal_main'
C:\Users\LOSSES Don\AppData\Local\Programs\Crystal\src\crystal\main.cr:129 in 'main_user_code'
C:\Users\LOSSES Don\AppData\Local\Programs\Crystal\src\crystal\main.cr:115 in 'main'
C:\Users\LOSSES Don\AppData\Local\Programs\Crystal\src\crystal\main.cr:141 in 'main'
C:\Users\LOSSES Don\AppData\Local\Programs\Crystal\src\crystal\system\win32\wmain.cr:37 in 'wmain'
D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288 in '__scrt_common_main_seh'
C:\Windows\System32\KERNEL32.DLL +75133 in 'BaseThreadInitThunk'
C:\Windows\SYSTEM32\ntdll.dll +371288 in 'RtlUserThreadStart'
Error executing process: 'which tput': The system cannot find the file specified.

Changes

• Modified the has_tput? and has_stty? method to return false when running on Windows (win32 flag).
• Retained the existing behavior for non-Windows systems.

Rationale

The tput and stty command is used to manipulate terminal settings and is not available on Windows. Attempting to check for tput on Windows systems results in unnecessary errors. By adding a conditional check for the win32 flag, we can ensure that the method returns false on Windows, thereby avoiding any issues related to the absence of tput or stty.

Testing

• Verified that the has_tput? method returns false on Windows.