Fix $mybool |=... which is binary op, not boolean op

# Fix $mybool |=... which is binary op, not boolean op

This fixes PhanTypeInvalidLeftOperandOfBitwiseOp.
Replace $var |= ... with $var = ... || $var .
Add cast before ... when needed (@include does not always return bool).
|= always evaluates expression, there for || $var, not $var ||

htdocs/comm/propal/class/propal.class.php

@@ -3615,7 +3615,7 @@ class Propal extends CommonObject
 				$dir = dol_buildpath($reldir."core/modules/propale/");
 
 				// Load file with numbering class (if found)
-				$mybool |= @include_once $dir.$file;
+				$mybool = ((bool) @include_once $dir.$file) || $mybool;
 			}
 
 			if (!$mybool) {