Remove unnecessary skipPages annotations from test/test_manifest.json

- In the `ibwa-bad` case the sixteenth page contains corrupt/incomplete commands, but given that we're suppressing `Error`s by default now skipping hardly seems warranted any more.

 - In the `geothermal.pdf` case the first page contains an unsupported ColourSpace, but again we're suppressing `Error`s by default now and skipping hardly seems warranted any more.

test/test_manifest.json

@@ -1233,7 +1233,6 @@
        "md5": "6ca059d32b74ac2688ae06f727fee755",
        "link": true,
        "rounds": 1,
-       "skipPages": [ 16 ],
        "type": "load"
     },
     {  "id": "mixedfonts",
@@ -1511,7 +1510,6 @@
        "rounds": 1,
        "link": true,
        "lastPage": 5,
-       "skipPages": [1],
        "type": "eq"
     },
     {  "id": "issue919",