Fix another instance of the 'bat cache' bug, closes #584

tests/integration_tests.rs

@@ -451,7 +451,7 @@ fn utf16() {
 
 #[test]
 fn can_print_file_named_cache() {
-    bat()
+    bat_with_config()
         .arg("cache")
         .assert()
         .success()
@@ -459,6 +459,16 @@ fn can_print_file_named_cache() {
         .stderr("");
 }
 
+#[test]
+fn can_print_file_starting_with_cache() {
+    bat_with_config()
+        .arg("cache.c")
+        .assert()
+        .success()
+        .stdout("test\n")
+        .stderr("");
+}
+
 #[test]
 fn does_not_print_unwanted_file_named_cache() {
     bat_with_config().arg("cach").assert().failure();