Send a backspace space backspace after shift in

Keeps the display cleaner when things work and the shift in byte
is displayed.  Should be harmless in cases where shift in is
interpreted per the standards.

xtrn/termtest/termtest.js

@@ -536,12 +536,12 @@ var tests = [
 		if (!interactive)
 			return null;
 		console.write("\x1b[=0M");
-		console.write("\x1b[MFCDEFG\x0e\x0f");
+		console.write("\x1b[MFCDEFG\x0e\x0f\x08 \x08");
 		var ret = console.yesno("Did you hear an ascending set of five notes");
 		if (ret)
 			return false;
 		console.write("\x1b[=2M");
-		console.write("\x1b[MFCDEFG\x0e\x0f");
+		console.write("\x1b[MFCDEFG\x0e\x0f\x08 \x08");
 		var ret = console.yesno("Did you hear an ascending set of five notes");
 		if (!ret)
 			return false;
@@ -551,7 +551,7 @@ var tests = [
 	{'name':'BCAM', 'func':function() {
 		if (!interactive)
 			return null;
-		console.write("\x1b[NCDEFG\x0e\x0f");
+		console.write("\x1b[NCDEFG\x0e\x0f\x08 \x08");
 		return ret = console.yesno("Did you hear an ascending set of five notes");
 	}},
 	{'name':'DCH', 'func':function() {