base.bbclass: Drop unnecessary dirs setting

${D} is listed in cleandirs so no need to list it in dirs as well.
The default directory is ${B} so this is a cleanup which should have
no changes to the execution.

[YOCTO #10017]

(From OE-Core rev: 7e0f95bf359bc3b5bb1578024a993e184de155cd)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/base.bbclass

@@ -309,7 +309,7 @@ base_do_compile() {
 }
 
 addtask install after do_compile
-do_install[dirs] = "${D} ${B}"
+do_install[dirs] = "${B}"
 # Remove and re-create ${D} so that is it guaranteed to be empty
 do_install[cleandirs] = "${D}"