oeqa/manual/toaster: fix small typo

PACKAGE_CLASES should be PACKAGE_CLASSES.

(From OE-Core rev: 7a96f3bceb2c857f841b1dbeb4587a8aaace529e)

Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/manual/toaster-managed-mode.json

@@ -136,7 +136,7 @@
           "expected_results": ""
         },
         "3": {
-          "action": "Check that default values are as follows: \n\tDISTRO - poky \n\tIMAGE_FSTYPES - ext3 jffs2 tar.bz2 \n\tIMAGE_INSTALL_append - \"Not set\" \n\tPACKAGE_CLASES - package_rpm \n        SSTATE_DIR  - /homeDirectory/poky/sstate-cache \n\n",
+          "action": "Check that default values are as follows: \n\tDISTRO - poky \n\tIMAGE_FSTYPES - ext3 jffs2 tar.bz2 \n\tIMAGE_INSTALL_append - \"Not set\" \n\tPACKAGE_CLASSES - package_rpm \n        SSTATE_DIR  - /homeDirectory/poky/sstate-cache \n\n",
           "expected_results": ""
         },
         "4": {