tests: remove non-applicable ${1} handling

The arg was never set. Furthermore as-is shellcheck cannot realistically
evaluate the included source.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

test/test_mangle

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. "${1:-./fstab-helpers}"
+. ./fstab-helpers
 . ./test/common
 
 ASSERT_streq ' deleted' "$(unmangle "$(mangle ' deleted')")"

test/test_option_twiddling

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. "${1:-./fstab-helpers}"
+. ./fstab-helpers
 . ./test/common
 
 optstring=rw,relatime,fd=29,pgrp=1,timeout=300,minproto=5,maxproto=5,direct

test/test_valid_number_of_base

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-. "${1:-./fstab-helpers}"
+. ./fstab-helpers
 . ./test/common
 
 EXPECT_success valid_number_of_base 16 feedfacebeef