Fixed totaling of CoinCollection's value.

PcgsInvUi/Views/MainWindow.axaml

@@ -48,7 +48,7 @@
                                         Binding="{Binding Designation}"
                                         IsReadOnly="True" />
                     <DataGridTextColumn Header="Est. Price" Width="*"
-                                        Binding="{Binding PriceGuideValue}"
+                                        Binding="{Binding PriceGuideValue, StringFormat='${0:0.00}'}"
                                         IsReadOnly="True" />
                     <DataGridTextColumn Header="PCGS #" Width="*"
                                         Binding="{Binding PCGSNo}"
@@ -77,4 +77,4 @@
             </DockPanel>
         </Grid>
     </SplitView>
-</Window>
+</Window>