[FIR] Don't require delegated constructor calls for expect constructors

#KT-59640 Fixed

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirCommonConstructorDelegationIssuesChecker.kt

@@ -13,6 +13,7 @@ import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
 import org.jetbrains.kotlin.fir.declarations.FirConstructor
 import org.jetbrains.kotlin.fir.declarations.FirRegularClass
 import org.jetbrains.kotlin.fir.declarations.FirResolvePhase
+import org.jetbrains.kotlin.fir.declarations.utils.isExpect
 import org.jetbrains.kotlin.fir.diagnostics.FirDiagnosticHolder
 import org.jetbrains.kotlin.fir.references.*
 import org.jetbrains.kotlin.fir.symbols.SymbolInternals
@@ -61,7 +62,8 @@ object FirCommonConstructorDelegationIssuesChecker : FirRegularClassChecker() {
             for (it in otherConstructors) {
                 // couldn't find proper super() constructor implicitly
                 if (it.delegatedConstructor?.calleeReference is FirDiagnosticHolder &&
-                    it.delegatedConstructor?.source?.kind is KtFakeSourceElementKind
+                    it.delegatedConstructor?.source?.kind is KtFakeSourceElementKind &&
+                    !it.isExpect
                 ) {
                     reporter.reportOn(it.source, FirErrors.EXPLICIT_DELEGATION_CALL_REQUIRED, context)
                 }

compiler/testData/diagnostics/tests/multiplatform/headerClass/explicitConstructorDelegation.fir.kt

@@ -7,7 +7,7 @@ expect open class A {
 }
 
 expect class B : A {
-    <!EXPLICIT_DELEGATION_CALL_REQUIRED!>constructor(i: Int)<!>
+    constructor(i: Int)
 
     constructor() : super("B")
 }