Fix failing AddSourceButton Tests

[ThadHouse]

#952 enabled tests in Java 11, which showed 2 tests that are failing in Master.

GRIP/ui/src/test/java/edu/wpi/grip/ui/pipeline/AddSourceButtonTest.java

Line 97 in 8923d10

@Ignore("Fails on all platforms") // TODO: Figure out why this is broken.

GRIP/ui/src/test/java/edu/wpi/grip/ui/pipeline/AddSourceButtonTest.java

Line 174 in 8923d10

@Ignore("Fails on all platforms") // TODO: Figure out why this is broken.