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webfs: do not unescape escape

--- a/sys/src/cmd/webfs/url.c

+++ b/sys/src/cmd/webfs/url.c

@@ -31,7 +31,7 @@

 	for(r=w=s; x = *r; r++){

 		if(x == '%' && isxdigit(r[1]) && isxdigit(r[2])){

 			x = (dhex(r[1])<<4)|dhex(r[2]);

-			if(x == 0 || (x > 0x1F && x < 0x7F && strchr(spec, x))){

+			if(x == 0 || x == '%' || (x > 0x1F && x < 0x7F && strchr(spec, x))){

 				*w++ = '%';

 				*w++ = toupper(r[1]);

 				*w++ = toupper(r[2]);

-- 

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