update tests for latest shelltestrunner

tests/add-bad-date-fails.test

@@ -1,4 +1,4 @@
-; ignore the binary we are invoked with
+# ignore the binary we are invoked with
 -f/dev/null; echo "2009/1/32" | hledger add 2>&1 | tail -1 | sed -e's/\[[^]]*\]//g'
 >>>
 date : date : 

tests/add-blank-date.test

@@ -1,4 +1,4 @@
-; ignore the binary we are invoked with
+# ignore the binary we are invoked with
 -f/dev/null; echo | hledger add 2>&1 |tail -1 |sed -e's/\[[^]]*\]//g'
 >>>
 date : description: 

tests/add-blank-description-fails.test

@@ -1,4 +1,4 @@
-; ignore the binary we are invoked with
+# ignore the binary we are invoked with
 -f/dev/null; printf "\n\n" | hledger add 2>&1 |tail -1 | sed -e's/\[[^]]*\]//g'
 >>>
 date : description: description: 

tests/unbalanced.test

@@ -1,4 +1,4 @@
-; shouldn't exit code be 1 ?
+# shouldn't exit code be 1 ?
 register
 <<<
 2009/1/1 a