[ALICE3] Fix ditrack reserve size in AsymmetricPairing

[axti98]

No description provided.

[github-actions]

O2 linter results: ❌ 6 errors, ⚠️ 2 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for ab315bb at 2026-09-01 12:37:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 6 errors and 3 warnings.'
Found 6 errors and 3 warnings.
++ [[ 6 -gt 0 ]]
++ cat /sw/BUILD/40cc8f5a80c73a0e92524c567250c1bfeac34198/O2Physics-code-check/errors.txt
ALICE3/TableProducer/alice3DqTableMaker.cxx:66:97: error: no header providing "o2::aod::PVMults" is directly included [misc-include-cleaner,-warnings-as-errors]
ALICE3/TableProducer/alice3DqTableMaker.cxx:66:111: error: no header providing "o2::aod::MultsGlobal" is directly included [misc-include-cleaner,-warnings-as-errors]
ALICE3/TableProducer/alice3DqTableMaker.cxx:66:129: error: no header providing "o2::aod::CentRun2V0Ms" is directly included [misc-include-cleaner,-warnings-as-errors]
ALICE3/TableProducer/alice3DqTableMaker.cxx:313:67: error: narrowing conversion from 'double' to 'Int_t' (aka 'int') [bugprone-narrowing-conversions,-warnings-as-errors]
ALICE3/Tasks/alice3DqEfficiency.cxx:333:30: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
ALICE3/Tasks/alice3DqEfficiency.cxx:1612:29: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
++ [[ 3 -gt 0 ]]
++ cat /sw/BUILD/40cc8f5a80c73a0e92524c567250c1bfeac34198/O2Physics-code-check/warnings.txt
ALICE3/DataModel/ReducedTablesAlice3.h:154:32: warning: do not use 'else' after 'return' [readability-else-after-return]
ALICE3/TableProducer/alice3DqTableMaker.cxx:144:35: warning: statement should be inside braces [readability-braces-around-statements]
ALICE3/TableProducer/alice3DqTableMaker.cxx:626:31: warning: statement should be inside braces [readability-braces-around-statements]
++ [[ 6 -gt 0 ]]
++ exit 1
--

Full log here.