Fix ui build warning

nyalldawson · nyalldawson · commit aaeaf97f2cbb · 2016-12-15T07:49:54.000+10:00
diff --git a/src/ui/composer/qgscomposerlegendwidgetbase.ui b/src/ui/composer/qgscomposerlegendwidgetbase.ui
@@ -966,7 +966,7 @@
            </widget>
           </item>
           <item row="7" column="0">
-           <widget class="QLabel" name="label_12">
+           <widget class="QLabel" name="label_121">
             <property name="text">
              <string>Line space</string>
             </property>
