community/megasdk: fix tests
Fix error during compiling of tests due to missing header includes, found during a rebuild on a 3.21 builder.
tests/unit/utils_test.cpp: In member function 'virtual void Filesystem_EscapesReservedCharacters_Test::TestBody()':
tests/unit/utils_test.cpp:86:26: error: 'setfill' is not a member of 'std'
86 | << std::setfill('0')
| ^~~~~~~
tests/unit/utils_test.cpp:32:1: note: 'std::setfill' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
31 | #include <mega/json.h>
+++ |+#include <iomanip>
32 |
tests/unit/utils_test.cpp:87:26: error: 'setw' is not a member of 'std'
87 | << std::setw(2)
| ^~~~
tests/unit/utils_test.cpp:87:26: note: 'std::setw' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'