Squiz/NonExecutableCode: fold duplicate code

Follow up on commits 0e10f43 and 01754d9, which both deal with fixing bugs where the sniff would not handle if/elseif/else conditions without curly braces correctly.

This commit merges the two near duplicate code blocks, which the above mentioned commits introduced, each containing code doing essentially the same thing.

Also note that `T_ELSE` is handled separately now as `else` does not take parentheses and can therefore not be a parenthesis owner.

This change is already covered by pre-existing tests.

src/Standards/Squiz/Sniffs/PHP/NonExecutableCodeSniff.php

@@ -94,21 +94,13 @@ public function process(File $phpcsFile, $stackPtr)
             }
         }//end if
 
-        // Check if this token is actually part of a one-line IF or ELSE statement.
-        for ($i = ($stackPtr - 1); $i > 0; $i--) {
-            if ($tokens[$i]['code'] === T_CLOSE_PARENTHESIS) {
-                $i = $tokens[$i]['parenthesis_opener'];
-                continue;
-            } else if (isset(Tokens::$emptyTokens[$tokens[$i]['code']]) === true) {
-                continue;
-            }
-
-            break;
-        }
-
-        if ($tokens[$i]['code'] === T_IF
-            || $tokens[$i]['code'] === T_ELSE
-            || $tokens[$i]['code'] === T_ELSEIF
+        // This token may be part of an inline condition.
+        // If we find a closing parenthesis that belongs to a condition,
+        // or an "else", we should ignore this token.
+        if ($tokens[$prev]['code'] === T_ELSE
+            || (isset($tokens[$prev]['parenthesis_owner']) === true
+            && ($tokens[$tokens[$prev]['parenthesis_owner']]['code'] === T_IF
+            || $tokens[$tokens[$prev]['parenthesis_owner']]['code'] === T_ELSEIF))
         ) {
             return;
         }
@@ -176,21 +168,6 @@ public function process(File $phpcsFile, $stackPtr)
             }//end if
         }//end if
 
-        // This token may be part of an inline condition.
-        // If we find a closing parenthesis that belongs to a condition
-        // we should ignore this token.
-        if (isset($tokens[$prev]['parenthesis_owner']) === true) {
-            $owner  = $tokens[$prev]['parenthesis_owner'];
-            $ignore = [
-                T_IF     => true,
-                T_ELSE   => true,
-                T_ELSEIF => true,
-            ];
-            if (isset($ignore[$tokens[$owner]['code']]) === true) {
-                return;
-            }
-        }
-
         $ourConditions = array_keys($tokens[$stackPtr]['conditions']);
 
         if (empty($ourConditions) === false) {