add missing "exec" calls

testsuite/expect/test6.11

@@ -123,7 +123,7 @@ expect {
 }
 
 if {$exit_code == 0} {
-	$bin_rm -f id_script
+	exec $bin_rm -f id_script
 	send_user "\nSUCCESS\n"
 }
 exit $exit_code

testsuite/expect/test7.1

@@ -171,7 +171,7 @@ if {$prio3 != 0} {
 }
 
 if {$exit_code == 0} {
-	$bin_rm -f pwd_script
+	exec $bin_rm -f pwd_script
 	send_user "\nSUCCESS\n"
 }
 exit $exit_code