fix: cmake samuraiConfig bug (#255)

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## Description
Fix the right variable names into samuraiConfig.cmake.in.
Fix also typo in CMakeLists.txt for Field container list (while not yet
encountering issue with these lines).

## Related issue
Before that fix, cmake was complaining "string no output variable
specified" pointing to samuraiConfig.cmake line 81.

## How has this been tested?
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## Code of Conduct
By submitting this PR, you agree to follow our [Code of
Conduct](https://github.com/hpc-maths/samurai/blob/master/docs/CODE_OF_CONDUCT.md)
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Co-authored-by: Nicolas Grenier <nicolas.grenier@lisn.upsaclay.fr>

CMakeLists.txt

@@ -217,7 +217,7 @@ if(SAMURAI_CONTAINER_LAYOUT_COL_MAJOR)
 endif()
 
 if(NOT SAMURAI_FIELD_CONTAINER IN_LIST FIELD_CONTAINER_LIST)
-  message(FATAL_ERROR "SAMURAI_FIELD_CONTAINER must be one of: ${FLUX_CONTAINER_LIST}")
+  message(FATAL_ERROR "SAMURAI_FIELD_CONTAINER must be one of: ${FIELD_CONTAINER_LIST}")
 else()
   string(TOUPPER ${SAMURAI_FIELD_CONTAINER} SAMURAI_FIELD_CONTAINER)
   target_compile_definitions(samurai INTERFACE SAMURAI_FIELD_CONTAINER_${SAMURAI_FIELD_CONTAINER})

cmake/samuraiConfig.cmake.in

@@ -34,6 +34,6 @@ set_property(CACHE SAMURAI_FLUX_CONTAINER PROPERTY STRINGS ${FLUX_CONTAINER_LIST
 if(NOT SAMURAI_FLUX_CONTAINER IN_LIST FLUX_CONTAINER_LIST)
     message(FATAL_ERROR "SAMURAI_FLUX_CONTAINER must be one of: ${FLUX_CONTAINER_LIST}")
 else()
-    string(TOUPPER ${FLUX_CONTAINER} FLUX_CONTAINER)
-    target_compile_definitions(samurai::samurai INTERFACE FLUX_CONTAINER_${FLUX_CONTAINER})
+    string(TOUPPER ${SAMURAI_FLUX_CONTAINER} SAMURAI_FLUX_CONTAINER)
+    target_compile_definitions(samurai::samurai INTERFACE SAMURAI_FLUX_CONTAINER_${SAMURAI_FLUX_CONTAINER})
 endif()