set background mining to No

src/wallet/wallet2.cpp

@@ -1113,7 +1113,7 @@ wallet2::wallet2(network_type nettype, uint64_t kdf_rounds, bool unattended):
   m_segregation_height(0),
   m_ignore_fractional_outputs(true),
   m_track_uses(false),
-  m_setup_background_mining(BackgroundMiningMaybe),
+  m_setup_background_mining(BackgroundMiningNo),
   m_is_initialized(false),
   m_kdf_rounds(kdf_rounds),
   is_old_file_format(false),
@@ -3789,7 +3789,7 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
     m_segregation_height = 0;
     m_ignore_fractional_outputs = true;
     m_track_uses = false;
-    m_setup_background_mining = BackgroundMiningMaybe;
+    m_setup_background_mining = BackgroundMiningNo;
     m_subaddress_lookahead_major = SUBADDRESS_LOOKAHEAD_MAJOR;
     m_subaddress_lookahead_minor = SUBADDRESS_LOOKAHEAD_MINOR;
     m_original_keys_available = false;