FIR Completion: Drop originalPosition parameter from getScopeContextForPosition

- It is easier to retrieve the original enclosing function by the fake
enclosing function than trying to correct the `originalPosition` in
different situations

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/KtAnalysisSession.kt

@@ -69,8 +69,8 @@ abstract class KtAnalysisSession(override val token: ValidityToken) : ValidityTo
 
     fun KtType.getTypeScope(): KtScope? = scopeProvider.getTypeScope(this)
 
-    fun KtFile.getScopeContextForPosition(originalPosition: PsiElement, positionInFakeFile: KtElement): KtScopeContext =
-        scopeProvider.getScopeContextForPosition(this, originalPosition, positionInFakeFile)
+    fun KtFile.getScopeContextForPosition(positionInFakeFile: KtElement): KtScopeContext =
+        scopeProvider.getScopeContextForPosition(this, positionInFakeFile)
 
     fun KtDeclaration.getSymbol(): KtSymbol = symbolProvider.getSymbol(this)
 

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/components/KtScopeProvider.kt

@@ -23,7 +23,6 @@ abstract class KtScopeProvider : KtAnalysisSessionComponent() {
 
     abstract fun getScopeContextForPosition(
         originalFile: KtFile,
-        originalPosition: PsiElement,
         positionInFakeFile: KtElement
     ): KtScopeContext
 }