Increase limit of maximum number of articles per feed

Closes #16690.
PR #16698.

Co-authored-by: An0n <79678786+an0n666@users.noreply.github.com>

src/gui/optionsdialog.ui

@@ -2789,7 +2789,7 @@ Disable encryption: Only connect to peers without protocol encryption</string>
                  <item row="1" column="1">
                   <widget class="QSpinBox" name="spinRSSMaxArticlesPerFeed">
                    <property name="maximum">
-                    <number>9999</number>
+                    <number>2147483646</number>
                    </property>
                    <property name="value">
                     <number>100</number>