Remove unneeded cppcheck suppression

Author: martinhsv

test/cppcheck_suppressions.txt

@@ -49,7 +49,6 @@ functionStatic:src/operators/geo_lookup.h:35
 duplicateBreak:src/operators/validate_utf8_encoding.cc
 syntaxError:src/transaction.cc:62
 noConstructor:src/variables/variable.h:152
-duplicateBranch:src/request_body_processor/multipart.cc:93
 danglingTempReference:src/modsecurity.cc:206
 knownConditionTrueFalse:src/operators/validate_url_encoding.cc:77
 knownConditionTrueFalse:src/operators/verify_svnr.cc:87