Make PHPDefineConstant much shorter

[szepeviktor]

Spare some bytes on the disk.

[codecov]

Codecov Report

Merging #7 into master will increase coverage by 0.46%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master       #7      +/-   ##
============================================
+ Coverage     29.28%   29.75%   +0.46%     
+ Complexity      735      733       -2     
============================================
  Files            29       29              
  Lines          1820     1815       -5     
============================================
+ Hits            533      540       +7     
+ Misses         1287     1275      -12     

Impacted Files	Coverage Δ	Complexity Δ
...c/voku/SimplePhpParser/Model/PHPDefineConstant.php	0.00% <0.00%> (ø)	7.00 <0.00> (-2.00)
...rc/voku/SimplePhpParser/Parsers/PhpCodeChecker.php	92.24% <0.00%> (+3.01%)	127.00% <0.00%> (ø%)

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