FIR checker: fix positioning of CONFLICTING_IMPORT

FE1.0 puts it on the alias when applicable.

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt

@@ -1322,7 +1322,7 @@ object DIAGNOSTICS_LIST : DiagnosticList("FirErrors") {
             parameter<Name>("name")
         }
 
-        val CONFLICTING_IMPORT by error<KtImportDirective>(PositioningStrategy.IMPORT_LAST_NAME) {
+        val CONFLICTING_IMPORT by error<KtImportDirective>(PositioningStrategy.IMPORT_ALIAS) {
             parameter<Name>("name")
         }
 

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/model/RegularDiagnosticData.kt

@@ -108,6 +108,7 @@ enum class PositioningStrategy(private val strategy: String? = null) {
     ENUM_MODIFIER,
     FIELD_KEYWORD,
     TAILREC_MODIFIER,
+    IMPORT_ALIAS,
     PROPERTY_DELEGATE,
 
     ;