maint: use standard spacing in shebang line in tests

It's better to be consistent even though spacing is insignificant:
http://www.in-ulm.de/~mascheck/various/shebang/#blankrequired

tests/install/basic-1.sh

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Basic tests for "install".
 
 # Copyright (C) 1998-2015 Free Software Foundation, Inc.

tests/install/create-leading.sh

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Test -D option.
 
 # Copyright (C) 2000-2015 Free Software Foundation, Inc.

tests/misc/help-version.sh

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Make sure all of these programs work properly
 # when invoked with --help or --version.
 

tests/misc/nice.sh

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Test "nice".
 
 # Copyright (C) 2002-2015 Free Software Foundation, Inc.

tests/misc/stty-row-col.sh

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Test "stty" with rows and columns.
 
 # Copyright (C) 1998-2015 Free Software Foundation, Inc.

tests/misc/stty.sh

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Make sure stty can parse most of its options.
 
 # Copyright (C) 1998-2015 Free Software Foundation, Inc.

tests/mv/into-self.sh

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Demonstrate how mv fails when it tries to move a directory into itself.
 
 # Copyright (C) 1998-2015 Free Software Foundation, Inc.

tests/mv/mv-special-1.sh

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Test "mv" with special files.
 
 # Copyright (C) 1998-2015 Free Software Foundation, Inc.

tests/no-perl

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 # Perl is not available, the test should be considered skipped.
 # FD 9 should have been opened by the test suite harness, pointing
 # to the original stderr (usually, the user's terminal).

tests/other-fs-tmpdir

@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 
 # Use stat to find a writable directory on a file system different from that
 # of the current directory.  If one is found, create a temporary directory