Add zoom text only webkit feature settings

Piedro, because of your comment about Midori, I tried applying this.
I don't think this fixes your problem, but it surely "hides" the
bug ;)

CCBUG: 295446

src/application.cpp

@@ -537,6 +537,7 @@ void Application::updateConfiguration()
     // ================ WebKit ============================
     defaultSettings->setAttribute(QWebSettings::DnsPrefetchEnabled, ReKonfig::dnsPrefetch());
     defaultSettings->setAttribute(QWebSettings::PrintElementBackgrounds, ReKonfig::printElementBackgrounds());
+    defaultSettings->setAttribute(QWebSettings::ZoomTextOnly, ReKonfig::zoomTextOnly());
 
     defaultSettings->setAttribute(QWebSettings::JavascriptEnabled, ReKonfig::javascriptEnabled());
     defaultSettings->setAttribute(QWebSettings::JavascriptCanOpenWindows, ReKonfig::javascriptCanOpenWindows());

src/rekonq.kcfg

@@ -219,6 +219,9 @@
     <entry name="printElementBackgrounds" type="Bool">
         <default>true</default>
     </entry>
+    <entry name="zoomTextOnly" type="Bool">
+        <default>false</default>
+    </entry>
 </group>
 
 

src/settings/settings_webkit.ui

@@ -72,6 +72,13 @@
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="QCheckBox" name="kcfg_zoomTextOnly">
+        <property name="text">
+         <string>Zoom Text only</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>