Remove extraneous copy of lake_cabin_water terrain from lighthouse #95059

Job	Run time
skip-duplicates-code	5s
skip-duplicates-data	4s
matrix-variables	1s
Basic Build and Test (Clang 10, Ubuntu, Curses)	57m 10s
Clang 14, macOS 12, Tiles, Sound, x64 and arm64 Universal Binary	1h 17m 18s
GCC 9, Curses, LTO	56m 44s
Clang 12, Ubuntu, Tiles, ASan	1h 27m 53s
GCC 11, Ubuntu, Curses, ASan	1s
GCC 12, Ubuntu cross-compile to MinGW-Win64, Tiles, Sound	1s
GCC 9, Ubuntu, Tiles, Sound, CMake	1s
emscripten	0s
	4h 39m 18s

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