bazel: Generated DEF files have incorrect LIBRARY statement

[ThadHouse]

Existing generation is LIBRARY shared/datalog

LIBRARY statements need to just have a single string in them with no path separators, and is just the name of the library.

[auscompgeek]

I presume this name is coming from here:

allwpilib/datalog/BUILD.bazel

Lines 33 to 34 in 632eb09

	wpilib_cc_shared_library(
	name = "shared/datalog",

I'm not sure I understand this naming convention either