Generic/ArrayIndent: remove T_COMMA from list of tokens to ignore

This commit removes T_COMMA from a list of tokens to ignore when
searching for the non-empty token before the start of the array. T_COMMA
was added to this list in 1697fac to fix a bug. See
squizlabs/PHP_CodeSniffer#3100 for more
details.

Back when this fix was introduced, it was necessary to ignore commas due
to a bug in findStartOfStatement() that would cause this method to
return the wrong token when passed the last token in a statement. This
bug has been fixed afterwards in ef80e53 and ignoring commas is not
necessary anymore. Now, the call to findStartOfStatement() in
https://github.com/squizlabs/PHP_CodeSniffer/blob/4cf6badaf0c177acaf295e2178f4383e2ea71b20/src/Standards/Generic/Sniffs/Arrays/ArrayIndentSniff.php#L67
correctly finds the start of the statement when passed the comma that
marks the end of the statement.

A test was added 1697fac. It would fail if running an older version of
PHPCS without ignoring commas, but now it passes:

https://github.com/squizlabs/PHP_CodeSniffer/pull/3101/files#diff-f786a9f6c41b82204dc89de2c02437c0e44401d580b02fcbde6278ea03f25693R83-R90

Author: rodrigoprimo

src/Standards/Generic/Sniffs/Arrays/ArrayIndentSniff.php

@@ -62,7 +62,6 @@ public function processMultiLineArray($phpcsFile, $stackPtr, $arrayStart, $array
         // Determine how far indented the entire array declaration should be.
         $ignore     = Tokens::$emptyTokens;
         $ignore[]   = T_DOUBLE_ARROW;
-        $ignore[]   = T_COMMA;
         $prev       = $phpcsFile->findPrevious($ignore, ($stackPtr - 1), null, true);
         $start      = $phpcsFile->findStartOfStatement($prev);
         $first      = $phpcsFile->findFirstOnLine(T_WHITESPACE, $start, true);