tests: "grep -e" is not portable to all platforms

The "-e" option to grep is not needed unless specifying more than one
pattern, which we don't do.  Remove it to avoid restricting the tests on
platforms that do not have a grep that recognises "-e".

Signed-off-by: John Keeping <john@keeping.me.uk>

tests/t0101-index.sh

@@ -5,14 +5,14 @@
 prepare_tests "Check content on index page"
 
 run_test 'generate index page' 'cgit_url "" >trash/tmp'
-run_test 'find foo repo' 'grep -e "foo" trash/tmp'
-run_test 'find foo description' 'grep -e "\[no description\]" trash/tmp'
-run_test 'find bar repo' 'grep -e "bar" trash/tmp'
-run_test 'find bar description' 'grep -e "the bar repo" trash/tmp'
-run_test 'find foo+bar repo' 'grep -e ">foo+bar<" trash/tmp'
-run_test 'verify foo+bar link' 'grep -e "/foo+bar/" trash/tmp'
-run_test 'verify "with%20space" link' 'grep -e "/with%20space/" trash/tmp'
-run_test 'no tree-link' '! grep -e "foo/tree" trash/tmp'
-run_test 'no log-link' '! grep -e "foo/log" trash/tmp'
+run_test 'find foo repo' 'grep "foo" trash/tmp'
+run_test 'find foo description' 'grep "\[no description\]" trash/tmp'
+run_test 'find bar repo' 'grep "bar" trash/tmp'
+run_test 'find bar description' 'grep "the bar repo" trash/tmp'
+run_test 'find foo+bar repo' 'grep ">foo+bar<" trash/tmp'
+run_test 'verify foo+bar link' 'grep "/foo+bar/" trash/tmp'
+run_test 'verify "with%20space" link' 'grep "/with%20space/" trash/tmp'
+run_test 'no tree-link' '! grep "foo/tree" trash/tmp'
+run_test 'no log-link' '! grep "foo/log" trash/tmp'
 
 tests_done