Fix overflow suppressing backup status in info output.

Writing the sz and szCplt parameters in the lock file used jsonWriteUInt64() but reading these parameters used jsonReadUInt(). This caused a silent exception for any backups larger than MAX_UINT and prevented the info command from reporting progress.

Correct this so the reads are symmetric and verified before/after with a test.

doc/xml/release/2024/2.50.xml

@@ -1,5 +1,19 @@
 <release date="XXXX-XX-XX" version="2.50dev" title="Under Development">
     <release-core-list>
+        <release-bug-list>
+            <release-item>
+                <github-issue id="2251"/>
+                <github-pull-request id="2252"/>
+
+                <release-item-contributor-list>
+                    <release-item-contributor id="robert.donovan"/>
+                    <release-item-reviewer id="joe.wildish"/>
+                </release-item-contributor-list>
+
+                <p>Fix overflow suppressing backup progress in <cmd>info</cmd> output.</p>
+            </release-item>
+        </release-bug-list>
+
         <release-improvement-list>
             <release-item>
                 <github-pull-request id="2197"/>

doc/xml/release/contributor.xml

@@ -565,6 +565,11 @@
     <contributor-id type="github">JBromage</contributor-id>
 </contributor>
 
+<contributor id="joe.wildish">
+    <contributor-name-display>Joe Wildish</contributor-name-display>
+    <contributor-id type="github">joewildish</contributor-id>
+</contributor>
+
 <contributor id="keith.fiske">
     <contributor-name-display>Keith Fiske</contributor-name-display>
     <contributor-id type="github">keithf4</contributor-id>
@@ -840,6 +845,11 @@
     <contributor-id type="github">vidierr</contributor-id>
 </contributor>
 
+<contributor id="robert.donovan">
+    <contributor-name-display>Robert Donovan</contributor-name-display>
+    <contributor-id type="github">rob-donovan</contributor-id>
+</contributor>
+
 <contributor id="rohit.raveendran">
     <contributor-name-display>Rohit Raveendran</contributor-name-display>
     <contributor-id type="github">rohitrav33ndran</contributor-id>