Changes to indentation whitespace in lexers/LexAbaqus.cxx

[Neil Hodgson]

g++ 6.1 has a new warning where the indentation of code may not represent the structure of the code. This triggered for the Abaqus lexer, so I reindented that portion to avoid the compiler warning. It is always possible that a seemingly simple benign change wrecked something so users of the Abaqus lexer should check the current code in the repository.

https://sourceforge.net/p/scintilla/code/ci/b79c15e32bcf7496ed703e29a3d563f9578f3e55/

Neil