Auto merge of #1445 - bitcartel:master_fix_filtered_notes, r=str4d

Fix casting error in GetFilteredNotes

Use int for minDepth like upstream instead of size_t which can lead to casting problems if a wallet tx has a depth of -1.
Also don't use FindMyNotes as mapNoteData has already been set on wallet tx.

@str4d As dicussed. This should be merged before other PRs related to wallet.

src/wallet/wallet.h

@@ -906,7 +906,7 @@ public:
     void SetBroadcastTransactions(bool broadcast) { fBroadcastTransactions = broadcast; }
     
     /* Find notes filtered by payment address, min depth, ability to spend */
-    bool GetFilteredNotes(std::vector<CNotePlaintextEntry> & outEntries, std::string address, size_t minDepth, bool ignoreSpent=true);
+    bool GetFilteredNotes(std::vector<CNotePlaintextEntry> & outEntries, std::string address, int minDepth=1, bool ignoreSpent=true);
     
 };