Fix missing braces warning on clang

Fix warnings on develop about missing braces. This is related to a bug in clang: https://bugs.llvm.org/show_bug.cgi?id=21629

Modules/Wrappers/ApplicationEngine/include/otbWrapperTypes.h

@@ -64,7 +64,7 @@ typedef enum
 
 namespace
 {
-constexpr std::array<const char*, 24> parameterTypesStrings = {
+constexpr std::array<const char*, 24> parameterTypesStrings = {{
   "Int",
   "Float",
   "String",
@@ -89,7 +89,7 @@ constexpr std::array<const char*, 24> parameterTypesStrings = {
   "OutputProcessXML",
   "InputProcessXML",
   "Bool"
-};
+}};
 }
 
 // Free functions to convert from and to std::string