PSR2.Classes.PropertyDeclaration: add T_STATIC to tokens list

In addition to scope modifiers, class properties currently have five
modifier tokens: T_ABSTRACT, T_FINAL, T_READONLY, T_STATIC and T_VAR.
The blame for this sniff does not explain why all but T_STATIC were
added to the set of modifier tokens in the search list. T_VAR has been
present since the file's creation and the other three were added one at
a time as those modifiers were added. To that extent, perhaps T_STATIC
was missed because the sniff itself uses getMemberProperties() and
code to perform explicit checks on those properties? I'm not sure.

Author: jrchamp

src/Standards/PSR2/Sniffs/Classes/PropertyDeclarationSniff.php

@@ -60,6 +60,7 @@ protected function processMemberVar(File $phpcsFile, int $stackPtr)
         $find   = Tokens::SCOPE_MODIFIERS;
         $find[] = T_VARIABLE;
         $find[] = T_VAR;
+        $find[] = T_STATIC;
         $find[] = T_READONLY;
         $find[] = T_FINAL;
         $find[] = T_ABSTRACT;