Move "use strict" back to function scope
Move "use strict" back to function scope

Just to avoid issues if idbstore is concatinated w/ third party files

rubenstolk/IDBWrapper,jensarps/IDBWrapper,safetychanger/IDBWrapper,jayfunk/IDBWrapper,mizchi/idb-wrapper-promisify,jensarps/IDBWrapper,kilbot/IDBWrapper,GerHobbelt/IDBWrapper,jayfunk/IDBWrapper,rubenstolk/IDBWrapper,kilbot/IDBWrapper,mizchi/idb-wrapper-promisify,safetychanger/IDBWrapper