Bug 1856795 - Remove redundant member init r=emilio

Done with:
./mach static-analysis check --checks="-*, readability-redundant-member-init" --fix .

https://clang.llvm.org/extra/clang-tidy/checks/readability/redundant-member-init.html

Differential Revision: https://phabricator.services.mozilla.com/D190002

layout/svg/SVGTextFrame.cpp

@@ -1421,7 +1421,6 @@ class MOZ_STACK_CLASS TextFrameIterator {
       : mRootFrame(aRoot),
         mSubtree(aSubtree),
         mCurrentFrame(aRoot),
-        mCurrentPosition(),
         mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree) {
     Init();
   }
@@ -1436,7 +1435,6 @@ class MOZ_STACK_CLASS TextFrameIterator {
                      ? aSubtree->GetPrimaryFrame()
                      : nullptr),
         mCurrentFrame(aRoot),
-        mCurrentPosition(),
         mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree) {
     Init();
   }