richedit: accept RTF stream that does not start with {\rtf1 in 1.0 emulation

[Alex Villací­s Lasso]

Quick fix to bug #8326

Changelog:
* Accept RTF stream that does not start with {\rtf1 in 1.0 emulation 
mode only

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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