Rename `eddy_graph_in.sh` to `eddy_graph.sh.in`

Following convention for the source of `configure_file`. See Scott
2021 k1077, § 19.7.

Overlap/CMakeLists.txt

@@ -18,6 +18,6 @@ target_link_libraries(eddy_graph PRIVATE ezmpi Jumble::jumble
   Shapelib_03::shapelib_03 Contour_531::contour_531 gpc_f Geometry::geometry
   NR_util::nr_util MPI::MPI_Fortran)
 
-configure_file(eddy_graph_in.sh eddy_graph.sh @ONLY)
+configure_file(eddy_graph.sh.in eddy_graph.sh @ONLY)
 execute_process(COMMAND chmod -w ${CMAKE_CURRENT_BINARY_DIR}/eddy_graph.sh)
 include(Tests/CMakeLists.txt)