patch 8.1.0151: mksession test fails on MS-Windows

Problem:    Mksession test fails on MS-Windows.
Solution:   Always use an argument for :lcd.

Author: brammool

src/testdir/test_mksession.vim

@@ -165,9 +165,9 @@ endfunc
 func Test_mksession_lcd_multiple_tabs()
   tabnew
   tabnew
-  lcd
+  lcd .
   tabfirst
-  lcd
+  lcd .
   mksession! Xtest_mks.out
   tabonly
   source Xtest_mks.out

src/version.c

@@ -789,6 +789,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    151,
 /**/
     150,
 /**/