Remove deprecated sniff rule

* Creation of dynamic property SlevomatCodingStandard\Sniffs\TypeHints\DeclareStrictTypesSniff::$newlinesCountBetweenOpenTagAndDeclare is deprecated
* this would give a warning in cs command
  and will cause cbf to fail

Author: pueppiblue

ProjektMOTORCodingStandard/ruleset.xml

@@ -169,7 +169,6 @@
 
     <rule ref="SlevomatCodingStandard.TypeHints.DeclareStrictTypes">
         <properties>
-            <property name="newlinesCountBetweenOpenTagAndDeclare" value="1"/>
             <property name="spacesCountAroundEqualsSign" value="0"/>
         </properties>
     </rule>