Ignore the small-sector unit test executable

Author: aidangarske

.gitignore

@@ -187,6 +187,7 @@ tools/unit-tests/unit-update-flash-db
 tools/unit-tests/unit-update-flash-flagshome
 tools/unit-tests/unit-update-flash-invert
 tools/unit-tests/unit-update-flash-int-invert
+tools/unit-tests/unit-update-flash-smallsector
 tools/unit-tests/unit-update-flash-enc-full
 tools/unit-tests/unit-update-flash-enc-intswap
 tools/unit-tests/unit-update-ram