FIR IDE: Simplify registerPsiQuickFixes

This change makes it possible to register multiple fixes for a
diagnostic. Also, the previous registerPsiQuickFix that relies compiler
to infer the KtFirDiagnostic type parameter is dangerous since it
can silently register fixes on interface `KtDiagnosticWithPsi` if caller
doesn't specify it explicitly.

nj2k/nj2k-services/src/org/jetbrains/kotlin/nj2k/postProcessing/J2kPostProcessor.kt

@@ -141,7 +141,7 @@ private val errorsFixingDiagnosticBasedPostProcessingGroup =
             Errors.INVISIBLE_MEMBER
         ),
         diagnosticBasedProcessing(
-            RemoveModifierFix.createRemoveModifierFactory(),
+            RemoveModifierFix.removeNonRedundantModifier,
             Errors.WRONG_MODIFIER_TARGET
         ),
         diagnosticBasedProcessing(
@@ -302,4 +302,4 @@ private val processings: List<NamedPostProcessingGroup> = listOf(
             FormatCodeProcessing()
         )
     )
-)
+)