Bug 1517: Increase length limit of host name

https://winscp.net/tracker/1517

Source commit: 31a1ca60c1f90b8234ef191eb0dcb9192be0a306

source/forms/Login.dfm

@@ -179,7 +179,7 @@ object LoginDialog: TLoginDialog
           Width = 236
           Height = 21
           Anchors = [akLeft, akTop, akRight]
-          MaxLength = 100
+          MaxLength = 255
           TabOrder = 5
           Text = 'HostNameEdit'
           OnChange = DataChange

source/forms/SiteAdvanced.dfm

@@ -1203,7 +1203,7 @@ object SiteAdvancedDialog: TSiteAdvancedDialog
             Width = 266
             Height = 21
             Anchors = [akLeft, akTop, akRight]
-            MaxLength = 50
+            MaxLength = 255
             TabOrder = 3
             Text = 'ProxyHostEdit'
             OnChange = DataChange
@@ -1450,7 +1450,7 @@ object SiteAdvancedDialog: TSiteAdvancedDialog
             Width = 266
             Height = 21
             Anchors = [akLeft, akTop, akRight]
-            MaxLength = 100
+            MaxLength = 255
             TabOrder = 0
             Text = 'TunnelHostNameEdit'
             OnChange = DataChange