[Qt] update form files for setting autoDefault explicitly to false

- also fixes indentation in one file (auto fixed by Qt Designer)
- removes several default parameters, which are not needed in the files
- related to #4840 (but not intended as fix for a no-bug)

src/qt/forms/receiverequestdialog.ui

@@ -74,6 +74,9 @@
        <property name="text">
         <string>Copy &amp;URI</string>
        </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
       </widget>
      </item>
      <item>
@@ -81,6 +84,9 @@
        <property name="text">
         <string>Copy &amp;Address</string>
        </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
       </widget>
      </item>
      <item>
@@ -88,6 +94,9 @@
        <property name="text">
         <string>&amp;Save Image...</string>
        </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
       </widget>
      </item>
      <item>