Changed minimum bridgesnum to 0

Author: corna

mainwindow.ui

@@ -1017,7 +1017,7 @@
           <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Sets the numer of bridges to be created (--bridgesnum bridges for each closed line)&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
          <property name="minimum">
-          <number>1</number>
+          <number>0</number>
          </property>
          <property name="maximum">
           <number>100</number>