STYLE: Disable clang-format style option AlignConsecutiveDeclarations

No longer enabled the style option of aligning consecutive declarations.

The convention of aligning declarations has always bothered some of us, as
appeared already during the discussion at https://discourse.itk.org/t/update-coding-style-for-itk/2055
(back in 2019).

While this style option may be just a matter of taste, it appears to hinder the
collaborative development process, as it pollutes [git] blame, it makes changes
to lines that aren't really changing, complicating code review, etc., as Sean
McBride remarked at InsightSoftwareConsortium#5015 (comment).
Moreover, it also triggers unnecessary git merge conflicts.

Now that clang-format is recently upgraded for ITK (pull request
InsightSoftwareConsortium#5015 commit
0b1fabd), it appears the right moment to
reconsider this option.

.clang-format

@@ -34,7 +34,7 @@ AlignConsecutiveBitFields:
   AlignFunctionPointers: false
   PadOperators:    false
 AlignConsecutiveDeclarations:
-  Enabled:         true
+  Enabled:         false
   AcrossEmptyLines: false
   AcrossComments:  false
   AlignCompound:   false