Fix warnings on non-static data member initializers (C++11 feature)

We're not formally using C++11 yet so those trigger compilation warnings
(at least with GCC 5):

./main/input_default.h:122:30: warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11
  CursorShape default_shape = CURSOR_ARROW;
                              ^

Note: We may allow those eventually (especially for non-int static const),
but most of current occurrences were inconsistent with all other classes.

See also http://www.stroustrup.com/C++11FAQ.html#member-init

visual_script_editor.h

@@ -37,6 +37,7 @@
 #include "scene/gui/graph_edit.h"
 #include "visual_script.h"
 #include "visual_script_property_selector.h"
+
 class VisualScriptEditorSignalEdit;
 class VisualScriptEditorVariableEdit;
 
@@ -159,7 +160,7 @@ class VisualScriptEditor : public ScriptEditorBase {
 	MemberType member_type;
 	String member_name;
 
-	bool seq_connect = false;
+	bool seq_connect;
 
 	PortAction port_action;
 	int port_action_node;