[Qt] add all used colors in txtablemodel to guiconstants

- add colors used in TX status decoration

src/qt/guiconstants.h

@@ -23,6 +23,12 @@ static const int STATUSBAR_ICONSIZE = 16;
 #define COLOR_NEGATIVE QColor(255, 0, 0)
 /* Transaction list -- bare address (without label) */
 #define COLOR_BAREADDRESS QColor(140, 140, 140)
+/* Transaction list -- TX status decoration - open until date */
+#define COLOR_TX_STATUS_OPENUNTILDATE QColor(64, 64, 255)
+/* Transaction list -- TX status decoration - offline */
+#define COLOR_TX_STATUS_OFFLINE QColor(192, 192, 192)
+/* Transaction list -- TX status decoration - default color */
+#define COLOR_BLACK QColor(0, 0, 0)
 
 /* Tooltips longer than this (in characters) are converted into rich text,
    so that they can be word-wrapped.

src/qt/transactiontablemodel.cpp

@@ -450,9 +450,9 @@ QVariant TransactionTableModel::txStatusDecoration(const TransactionRecord *wtx)
     {
     case TransactionStatus::OpenUntilBlock:
     case TransactionStatus::OpenUntilDate:
-        return QColor(64,64,255);
+        return COLOR_TX_STATUS_OPENUNTILDATE;
     case TransactionStatus::Offline:
-        return QColor(192,192,192);
+        return COLOR_TX_STATUS_OFFLINE;
     case TransactionStatus::Unconfirmed:
         return QIcon(":/icons/transaction_0");
     case TransactionStatus::Confirming:
@@ -476,8 +476,9 @@ QVariant TransactionTableModel::txStatusDecoration(const TransactionRecord *wtx)
     case TransactionStatus::MaturesWarning:
     case TransactionStatus::NotAccepted:
         return QIcon(":/icons/transaction_0");
+    default:
+        return COLOR_BLACK;
     }
-    return QColor(0,0,0);
 }
 
 QVariant TransactionTableModel::txWatchonlyDecoration(const TransactionRecord *wtx) const