UI: Update bundled themes with alternating row color

After rB479ce00809af the alternating row theme color is used in the file
browser. New colors were created by copying the outliner's alternating
row and window background colors.

Differential Revision: https://developer.blender.org/D8721

presets/interface_theme/deep_grey.xml

@@ -537,6 +537,7 @@
     </graph_editor>
     <file_browser>
       <ThemeFileBrowser
+        row_alternate="#4f4f4fff"
         selected_file="#c85130"
         >
         <space>
@@ -1486,4 +1487,4 @@
       </ThemeFontStyle>
     </widget>
   </ThemeStyle>
-</bpy>
+</bpy>

presets/interface_theme/maya.xml

@@ -537,6 +537,7 @@
     </graph_editor>
     <file_browser>
       <ThemeFileBrowser
+        row_alternate="#ffffff07"
         selected_file="#5b8199"
         >
         <space>

presets/interface_theme/minimal_dark.xml

@@ -533,6 +533,7 @@
     </graph_editor>
     <file_browser>
       <ThemeFileBrowser
+        row_alternate="#ffffff06"
         selected_file="#337fcc"
         >
         <space>

presets/interface_theme/modo.xml

@@ -537,14 +537,15 @@
     </graph_editor>
     <file_browser>
       <ThemeFileBrowser
+        row_alternate="#ffffff07"
         selected_file="#f49c1c"
         >
         <space>
           <ThemeSpaceGeneric
-            back="#484848"
+            back="#7e8990"
             title="#cccccc"
-            text="#cccccc"
-            text_hi="#cccccc"
+            text="#181818"
+            text_hi="#f49c1c"
             header="#383838ff"
             header_text="#cccccc"
             header_text_hi="#cccccc"

presets/interface_theme/print_friendly.xml

@@ -533,11 +533,12 @@
     </graph_editor>
     <file_browser>
       <ThemeFileBrowser
+        row_alternate="#ffffffff"
         selected_file="#76afff"
         >
         <space>
           <ThemeSpaceGeneric
-            back="#a4a4a4"
+            back="#d8d8d8"
             title="#000000"
             text="#000000"
             text_hi="#ffffff"

presets/interface_theme/white.xml

@@ -537,6 +537,7 @@
     </graph_editor>
     <file_browser>
       <ThemeFileBrowser
+        row_alternate="#00000007"
         selected_file="#0082ff"
         >
         <space>

presets/interface_theme/xsi.xml

@@ -537,11 +537,12 @@
     </graph_editor>
     <file_browser>
       <ThemeFileBrowser
+        row_alternate="#ffffff00"
         selected_file="#0078d7"
         >
         <space>
           <ThemeSpaceGeneric
-            back="#a5a3a3"
+            back="#aca8a7"
             title="#1300aa"
             text="#222222"
             text_hi="#ebebeb"