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/t0104-tree.sh

@@ -5,29 +5,29 @@
 prepare_tests "Check content on tree page"
 
 run_test 'generate bar/tree' 'cgit_url "bar/tree" >trash/tmp'
-run_test 'find file-1' 'grep -e "file-1" trash/tmp'
-run_test 'find file-50' 'grep -e "file-50" trash/tmp'
+run_test 'find file-1' 'grep "file-1" trash/tmp'
+run_test 'find file-50' 'grep "file-50" trash/tmp'
 
 run_test 'generate bar/tree/file-50' 'cgit_url "bar/tree/file-50" >trash/tmp'
 
 run_test 'find line 1' '
-	grep -e "<a class=.no. id=.n1. name=.n1. href=.#n1.>1</a>" trash/tmp
+	grep "<a class=.no. id=.n1. name=.n1. href=.#n1.>1</a>" trash/tmp
 '
 
 run_test 'no line 2' '
-	! grep -e "<a class=.no. id=.n2. name=.n2. href=.#n2.>2</a>" trash/tmp
+	! grep "<a class=.no. id=.n2. name=.n2. href=.#n2.>2</a>" trash/tmp
 '
 
 run_test 'generate foo+bar/tree' 'cgit_url "foo%2bbar/tree" >trash/tmp'
 
 run_test 'verify a+b link' '
-	grep -e "/foo+bar/tree/a+b" trash/tmp
+	grep "/foo+bar/tree/a+b" trash/tmp
 '
 
 run_test 'generate foo+bar/tree?h=1+2' 'cgit_url "foo%2bbar/tree&h=1%2b2" >trash/tmp'
 
 run_test 'verify a+b?h=1+2 link' '
-	grep -e "/foo+bar/tree/a+b?h=1%2b2" trash/tmp
+	grep "/foo+bar/tree/a+b?h=1%2b2" trash/tmp
 '
 
 tests_done