richedit: fix failing EM_GETCHARFORMAT test on all platforms

[Alex Villací­s Lasso]

Default richedit font (System) in Windows causes native richedit to 
report CFM_BOLD as always set, regardless of selection, or previous 
calls to EM_SETCHARFORMAT. Switch to Courier New in order to see that 
richedit really sets the CFM_BOLD attribute in the correct selection.

This fix was successful in removing failure in WinXP-SP2 (real machine) 
and in Win98 (QEMU virtual machine). However, could you please test on 
other platforms (win2k, win2k3, Vista) to see whether it removes the 
failure there too? I want to be extra sure that this test actually 
passes on all platforms.

Changelog:
* Fix failing EM_GETCHARFORMAT test on all platforms