Adapt to changes in the break point model

Apparently the "insert here" is gone. Makes the test go a bit
further, but will crash/assert later then:

#3 0x00007ffff3b28aab in qt_assert_x(char const*, char const*, char const*, int) () from /usr/lib/libQt5Core.so.5
#4 0x00007ffff7f40ca5 in QList<KDevelop::Breakpoint*>::at (i=-1, this=<optimized out>) at /usr/include/qt/QtCore/qlist.h:541
#5 KDevelop::BreakpointModel::updateHitCount (this=<optimized out>, row=row@entry=-1, hitCount=hitCount@entry=1)

at /home/milian/projects/kf5/src/extragear/kdevelop/kdevelop/kdevplatform/debugger/breakpoint/breakpointmodel.cpp:321

#6 0x00007ffff7f341a1 in KDevelop::IBreakpointController::updateHitCount (this=this@entry=0x555555bb59f0, row=row@entry=-1, hitCount=hitCount@entry=1)

at /home/milian/projects/kf5/src/extragear/kdevelop/kdevelop/kdevplatform/debugger/interfaces/ibreakpointcontroller.cpp:66

#7 0x00007ffff7f34436 in KDevelop::IBreakpointController::setHitCount (this=0x555555bb59f0, breakpoint=0x555555bc9b50, count=1)

at /home/milian/projects/kf5/src/extragear/kdevelop/kdevelop/kdevplatform/debugger/interfaces/ibreakpointcontroller.cpp:205

#8 0x000055555557fff3 in XDebug::BreakpointController::handleBreakpointList (this=0x555555bb59f0, xml=...)

at /home/milian/projects/kf5/src/extragear/kdevelop/plugins/kdev-xdebug/breakpointcontroller.cpp:137

#9 0x0000555555581fae in XDebug::Callback<XDebug::BreakpointController>::execute (this=0x555555bc8990, xml=...)

at /home/milian/projects/kf5/src/extragear/kdevelop/plugins/kdev-xdebug/connection.h:80