Change variable target_type to static_component_type in //:pdfium

A previous change [1] removed jumbo usage throughout PDFium. Builds with
pdf_is_complete_lib=true were breaking because 'target_type' is a
jumbo_component variable. The corresponding variable for component is
'static_component_type'.

[1] https://pdfium.googlesource.com/pdfium/+/0fab9e622a22e90ca08884beb3a0dd7b17776d46

Bug: pdfium:1414
Change-Id: I241a975b8e218e8d2c49c6bb08d2f81b3261e0f9
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/61890
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index 27ac719..ec0a94f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -191,7 +191,7 @@
   }
 
   if (pdf_is_complete_lib) {
-    target_type = "static_library"
+    static_component_type = "static_library"
     complete_static_lib = true
     configs -= [ "//build/config/compiler:thin_archive" ]
   }