TextEditor: Initialize some members

Coverity was complaining about these, in some places even rightly so:-)

Change-Id: Ia85cdd2c74f05edba6f0d4534aa9f2ee2a750595
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/texteditor/codeassist/runner.cpp

@@ -33,10 +33,6 @@ using namespace TextEditor;
 using namespace Internal;
 
 ProcessorRunner::ProcessorRunner()
-    : m_processor(0)
-    , m_interface(0)
-    , m_discardProposal(false)
-    , m_proposal(0)
 {}
 
 ProcessorRunner::~ProcessorRunner()