ccode: honor r2ghidra.casts instead of forcing casts off

ccode mode called setNoCastPrinting(true) after applying r2ghidra.casts, so
`e r2ghidra.casts=true` was silently overridden and semantically necessary
truncations disappeared. For

  long cast_test(long x) { return (long)(int)x + 0x100000000L; }

the output was `arg1 + 0x100000000`, which evaluates to 0xffffffff at
0xffffffff instead of the 0x1ffffffff the binary produces.

Let r2ghidra.casts decide: ccode keeps only the identifier cleanup and the
hidden implied ZEXT/SEXT extensions and no-convention prototype style. With
ccode=true,casts=true the printer now emits
`(int64_t)(int)arg1 + 0x100000000`; with casts=false it stays cast-free as the
option documents, and ccode=false output is unchanged.

Regression in test/db/extras/r2ghidra_ccode with the compiled fixture.

src/core_ghidra.cpp

@@ -233,11 +233,12 @@ static void Decompile(RCore *core, ut64 addr, DecompileMode mode, std::stringstr
 	bool showCasts = cfg_var_casts.GetBool (core->config);
 	r2c->setOptionNoCasts (!showCasts);
 	if (cfg_var_ccode.GetBool (core->config)) {
-		// CCODE-style output: no casts, hide implied ZEXT/SEXT extensions, drop the
+		// CCODE-style output: hide implied ZEXT/SEXT extensions and drop the
 		// calling convention from prototypes — closer to what Ghidra's toggleCCode
-		// emits and closer to plain standard C.
+		// emits and closer to plain standard C. Casts stay under the r2ghidra.casts
+		// option: forcing them off here would silently drop necessary truncations
+		// even when the user explicitly asked for them.
 		auto cc = dynamic_cast<PrintC *>(arch.print);
-		cc->setNoCastPrinting (true);
 		cc->setHideImpliedExts (true);
 		cc->setConvention (false);
 	}

test/bins/cast-test.c

@@ -0,0 +1,3 @@
+// r2ghidra.ccode=true must not drop the (int) truncation, even when casts are
+// explicitly requested with r2ghidra.casts=true.
+long cast_test(long x) { return (long)(int)x + 0x100000000L; }

test/db/extras/r2ghidra_ccode

@@ -39,3 +39,17 @@ EXPECT=<<EOF
     __libc_init(param_1,0,*(iRam00000424 + 0x418),&stack0xffffffec);
 EOF
 RUN
+
+NAME=ccode honors r2ghidra.casts and keeps necessary truncations
+FILE=bins/elf/x86_64-cast-test.o
+CMDS=<<EOF
+aa
+s sym.cast_test
+e r2ghidra.ccode=true
+e r2ghidra.casts=true
+pdg~return
+EOF
+EXPECT=<<EOF
+    return (int64_t)(int)arg1 + 0x100000000;
+EOF
+RUN