Add mapping for "multiple line" JAB state to NVDA state (#15557)
Fixes #14609
Summary of the issue:
NVDA doesn't report multi-line state for Java Access Bridge components that expose it.
Description of user facing changes
NVDA will correctly report multi-line state in applications using Java Access Bridge.
Description of development approach
Added mapping from "multiple line" JAB state to NVDA multiline state. There is already a mapping from "multi_line" JAB state to NVDA state, but the string was incorrect, so NVDA didn't announce it. JAB uses the string from the following resource file: https://github.com/openjdk/jdk/blob/516cfb135f7e5fefaf6e6f2928f6ecb88806f1ef/src/java.desktop/share/classes/com/sun/accessibility/internal/resources/accessibility_en.properties#L114. Existing "multi_line" value probably comes from the name of Java's AccessibleState.MULTI_LINE const, but it doesn't seem to have ever been used as a resource value after looking at the git history. I still kept it in the mapping to ensure backwards compatibility: while unlikely, it's possible that in older Java versions the value was "multi_line".
