Add option to remove '- Konsole' from window title

This may be overkill but for now add option to remove app name from
title.  The option is in the app-wide General Configure settings and
doesn't add unreasonable space to the dialog.

REVIEW: 115354
FEATURE: 307355
FIXED-IN: 2.13
(cherry picked from commit db6d9de83e)

src/MainWindow.cpp

@@ -272,7 +272,11 @@ void MainWindow::updateWindowCaption()
         caption = userTitle;
     }
 
-    setCaption(caption);
+    if (KonsoleSettings::showAppNameOnTitleBar()) {
+        setCaption(caption);
+    } else {
+        setPlainCaption(caption);
+    }
 }
 
 void MainWindow::updateWindowIcon()

src/settings/GeneralSettings.ui

@@ -93,6 +93,19 @@
           </property>
          </widget>
         </item>
+        <item row="5" column="0">
+         <widget class="QCheckBox" name="kcfg_ShowAppNameOnTitleBar">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+            <horstretch>0</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="text">
+           <string>Show application name on the titlebar</string>
+          </property>
+         </widget>
+        </item>
        </layout>
       </widget>
      </item>

src/settings/konsole.kcfg

@@ -15,6 +15,11 @@
       <tooltip>Show window title set by escape sequence on the titlebar</tooltip>
       <default>false</default>
     </entry>
+    <entry name="ShowAppNameOnTitleBar" type="Bool">
+      <label>Show "- Konsole" on the titlebar</label>
+      <tooltip>Show "- Konsole" on the titlebar</tooltip>
+      <default>true</default>
+    </entry>
     <entry name="AllowMenuAccelerators" type="Bool">
       <label>Enable menu accelerators</label>
       <tooltip>Allow users to access top menu through Alt+Key combination</tooltip>